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chore: release v4.21.0 (#4368)
Signed-off-by: Felipe Zipitria <[email protected]>
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‎CHANGES.md‎

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or the CRS Google Group at
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* https://groups.google.com/a/owasp.org/g/modsecurity-core-rule-set-project
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## Version 4.21.0-dev - 2025-MM-DD
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## Version 4.22.0-dev - 2025-MM-DD
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## Version 4.21.0 - 2025-12-01
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## What's Changed
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### 🆕 New features and detections 🎉
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* feat(931100): add IPv6 support / XML scan and SSH scheme. by @touchweb-vincent in https://github.com/coreruleset/coreruleset/pull/4321
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* feat(920440): add new restricted file extensions by @touchweb-vincent in https://github.com/coreruleset/coreruleset/pull/4322
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### 🧰 Other Changes
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* fix(942160): adding unit test for double comment by @touchweb-vincent in https://github.com/coreruleset/coreruleset/pull/4315
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* fix(920280, 920300, 920310, 920311, 920320, 920330): should be block by @touchweb-vincent in https://github.com/coreruleset/coreruleset/pull/4319
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* fix(942151,942152): wrong functions names by @touchweb-vincent in https://github.com/coreruleset/coreruleset/pull/4333
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* feat(942460): adding help for non-English folks by @touchweb-vincent in https://github.com/coreruleset/coreruleset/pull/4334
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* fix(932180): reduce substring false positives by @EsadCetiner in https://github.com/coreruleset/coreruleset/pull/4338
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* fix(942151,942152): wrong functions names by @touchweb-vincent in https://github.com/coreruleset/coreruleset/pull/4337
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* fix(920180): wrong unit test - content-type evasion bypass by @touchweb-vincent in https://github.com/coreruleset/coreruleset/pull/4339
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* fix(956110): move rule to pl-2 by @EsadCetiner in https://github.com/coreruleset/coreruleset/pull/4344
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* docs: comment on disabling `Expect` header in .Net by @theseion in https://github.com/coreruleset/coreruleset/pull/4348
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* fix: add missing capture action to affected rules by @airween in https://github.com/coreruleset/coreruleset/pull/4361
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**Full Changelog**: https://github.com/coreruleset/coreruleset/compare/v4.20.0...v4.21.0
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## Version 4.20.0 - 2025-11-02
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‎SECURITY.md‎

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| Version | Supported |
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| --------- | ------------------ |
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| 4.21.z | :white_check_mark: |
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| 4.20.z | :white_check_mark: |
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| 4.19.z | :white_check_mark: |
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| 4.y.z | :x: |
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| 3.3.x | :white_check_mark: |
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| 3.2.x | :x: |

‎crs-setup.conf.example‎

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# ------------------------------------------------------------------------
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# OWASP CRS ver.4.21.0-dev
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# OWASP CRS ver.4.21.0
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# Copyright (c) 2006-2020 Trustwave and contributors. All rights reserved.
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# Copyright (c) 2021-2025 CRS project. All rights reserved.
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#
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# t:none,\
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# nolog,\
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# tag:'OWASP_CRS',\
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# ver:'OWASP_CRS/4.21.0-dev',\
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# ver:'OWASP_CRS/4.21.0',\
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# setvar:tx.blocking_paranoia_level=1"
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# t:none,\
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# nolog,\
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# tag:'OWASP_CRS',\
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# ver:'OWASP_CRS/4.21.0-dev',\
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# ver:'OWASP_CRS/4.21.0',\
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# setvar:tx.detection_paranoia_level=1"
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# t:none,\
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# nolog,\
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# tag:'OWASP_CRS',\
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# ver:'OWASP_CRS/4.21.0-dev',\
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# ver:'OWASP_CRS/4.21.0',\
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# setvar:tx.enforce_bodyproc_urlencoded=1"
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# t:none,\
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# nolog,\
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# tag:'OWASP_CRS',\
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# ver:'OWASP_CRS/4.21.0-dev',\
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# ver:'OWASP_CRS/4.21.0',\
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# setvar:tx.critical_anomaly_score=5,\
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# setvar:tx.error_anomaly_score=4,\
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# setvar:tx.warning_anomaly_score=3,\
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# t:none,\
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# nolog,\
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# tag:'OWASP_CRS',\
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# ver:'OWASP_CRS/4.21.0-dev',\
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# ver:'OWASP_CRS/4.21.0',\
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# setvar:tx.inbound_anomaly_score_threshold=5,\
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# setvar:tx.outbound_anomaly_score_threshold=4"
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# t:none,\
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# nolog,\
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# tag:'OWASP_CRS',\
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# ver:'OWASP_CRS/4.21.0-dev',\
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# ver:'OWASP_CRS/4.21.0',\
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# setvar:tx.reporting_level=4"
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# t:none,\
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# nolog,\
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# tag:'OWASP_CRS',\
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# ver:'OWASP_CRS/4.21.0-dev',\
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# ver:'OWASP_CRS/4.21.0',\
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# setvar:tx.early_blocking=1"
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# t:none,\
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# nolog,\
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# tag:'OWASP_CRS',\
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# ver:'OWASP_CRS/4.21.0-dev',\
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# ver:'OWASP_CRS/4.21.0',\
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# setvar:tx.enable_default_collections=1"
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# t:none,\
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# nolog,\
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# tag:'OWASP_CRS',\
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# ver:'OWASP_CRS/4.21.0-dev',\
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# ver:'OWASP_CRS/4.21.0',\
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# setvar:'tx.allowed_methods=GET HEAD POST OPTIONS'"
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# Content-Types that a client is allowed to send in a request.
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# t:none,\
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# nolog,\
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# tag:'OWASP_CRS',\
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# ver:'OWASP_CRS/4.21.0-dev',\
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# ver:'OWASP_CRS/4.21.0',\
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# chain"
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# SecRule REQUEST_URI "@rx ^/foo/bar" \
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# "t:none,\
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# t:none,\
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# nolog,\
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# tag:'OWASP_CRS',\
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# ver:'OWASP_CRS/4.21.0-dev',\
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# ver:'OWASP_CRS/4.21.0',\
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# setvar:'tx.allowed_request_content_type=|application/x-www-form-urlencoded| |multipart/form-data| |text/xml| |application/xml| |application/soap+xml| |application/json| |application/reports+json| |application/csp-report|'"
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# Allowed HTTP versions.
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# t:none,\
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# nolog,\
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# ver:'OWASP_CRS/4.21.0-dev',\
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# ver:'OWASP_CRS/4.21.0',\
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# setvar:'tx.allowed_http_versions=HTTP/1.0 HTTP/1.1 HTTP/2 HTTP/2.0 HTTP/3 HTTP/3.0'"
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# Forbidden file extensions.
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# t:none,\
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# ver:'OWASP_CRS/4.21.0-dev',\
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# ver:'OWASP_CRS/4.21.0',\
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# setvar:'tx.restricted_extensions=.ani/ .asa/ .asax/ .ascx/ .back/ .backup/ .bak/ .bck/ .bk/ .bkp/ .bat/ .cdx/ .cer/ .cfg/ .cmd/ .cnf/ .com/ .compositefont/ .config/ .conf/ .copy/ .crt/ .cs/ .csproj/ .csr/ .dat/ .db/ .dbf/ .dist/ .dll/ .dos/ .dpkg-dist/ .drv/ .gadget/ .hta/ .htr/ .htw/ .ida/ .idc/ .idq/ .inc/ .inf/ .ini/ .jse/ .key/ .licx/ .lnk/ .log/ .mdb/ .msc/ .ocx/ .old/ .pass/ .pdb/ .pfx/ .pif/ .pem/ .pol/ .prf/ .printer/ .pwd/ .rdb/ .rdp/ .reg/ .resources/ .resx/ .sav/ .save/ .scr/ .sct/ .sh/ .shs/ .sql/ .sqlite/ .sqlite3/ .swp/ .sys/ .temp/ .tlb/ .tmp/ .vb/ .vbe/ .vbs/ .vbproj/ .vsdisco/ .vxd/ .webinfo/ .ws/ .wsc/ .wsf/ .wsh/ .xsd/ .xsx/'"
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# Restricted request headers.
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# ver:'OWASP_CRS/4.21.0',\
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# setvar:'tx.restricted_headers_basic=/content-encoding/ /proxy/ /lock-token/ /content-range/ /if/ /x-http-method-override/ /x-http-method/ /x-method-override/ /x-middleware-subrequest/ /expect/'"
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# t:none,\
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# nolog,\
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# ver:'OWASP_CRS/4.21.0',\
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# nolog,\
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# ver:'OWASP_CRS/4.21.0',\
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# setvar:'tx.allowed_request_content_type_charset=|utf-8| |iso-8859-1| |iso-8859-15| |windows-1252|'"
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# nolog,\
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# setvar:tx.max_num_args=255"
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# Block request if the length of any argument name is too high
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# t:none,\
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# nolog,\
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# tag:'OWASP_CRS',\
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# ver:'OWASP_CRS/4.21.0',\
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# setvar:tx.arg_name_length=100"
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# setvar:tx.arg_length=400"
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# Block request if the total length of all combined arguments is too high
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# ver:'OWASP_CRS/4.21.0',\
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# setvar:tx.sampling_percentage=100"
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# setvar:tx.crs_validate_utf8_encoding=1"
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# -- [[ Skip Checking Responses ]] ------------------------------------------------
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# setvar:tx.crs_skip_response_analysis=1"
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‎rules/REQUEST-900-EXCLUSION-RULES-BEFORE-CRS.conf.example‎

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# ------------------------------------------------------------------------
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# OWASP CRS ver.4.21.0-dev
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# OWASP CRS ver.4.21.0
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# Copyright (c) 2006-2020 Trustwave and contributors. All rights reserved.
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# Copyright (c) 2021-2025 CRS project. All rights reserved.
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#

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