CVE-2021-41819

CGI::Cookie.parse in Ruby through 2.6.8 mishandles security prefixes in cookie names. This also affects the CGI gem through 0.3.0 for Ruby.

CVSS v3 7.5 HIGH
CVSS v2.0 5.0 MEDIUM

7.5^/10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

5.0^/10

CVSS v2.0 : MEDIUM

V2 Legend

Vector : AV:N/AC:L/Au:N/C:N/I:P/A:N

Exploitability : 10.0 / Impact : 2.9

Access Vector NETWORK

Access Complexity LOW

Authentication NONE

Confidentiality Impact NONE

Integrity Impact PARTIAL

Availability Impact NONE

References

Link	Resource
https://hackerone.com/reports/910552	Permissions Required Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IUXQCH6FRKANCVZO2Q7D2SQX33FP3KWN/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UTOJGS5IEFDK3UOO7IY4OTTFGHGLSWZF/
https://security.gentoo.org/glsa/202401-27
https://security.netapp.com/advisory/ntap-20220121-0003/	Third Party Advisory
https://www.ruby-lang.org/en/news/2021/11/24/cookie-prefix-spoofing-in-cgi-cookie-parse-cve-2021-41819/	Exploit Vendor Advisory
https://hackerone.com/reports/910552	Permissions Required Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IUXQCH6FRKANCVZO2Q7D2SQX33FP3KWN/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UTOJGS5IEFDK3UOO7IY4OTTFGHGLSWZF/
https://security.gentoo.org/glsa/202401-27
https://security.netapp.com/advisory/ntap-20220121-0003/	Third Party Advisory
https://www.ruby-lang.org/en/news/2021/11/24/cookie-prefix-spoofing-in-cgi-cookie-parse-cve-2021-41819/	Exploit Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:ruby-lang:cgi:0.1.0:::::ruby::
	cpe:2.3:a:ruby-lang:cgi:0.2.0:::::ruby::
	cpe:2.3:a:ruby-lang:cgi:0.3.0:::::ruby::
	cpe:2.3:a:ruby-lang:ruby::::::::
	cpe:2.3:a:ruby-lang:ruby::::::::
	cpe:2.3:a:ruby-lang:ruby::::::::

Configuration 2 (hide)

OR	cpe:2.3:a:redhat:software_collections:-:::::::*
	cpe:2.3:o:redhat:enterprise_linux:8.0:::::::*

Configuration 3 (hide)

OR	cpe:2.3:o:debian:debian_linux:9.0:::::::*
	cpe:2.3:o:debian:debian_linux:10.0:::::::*
	cpe:2.3:o:debian:debian_linux:11.0:::::::*

Configuration 4 (hide)

OR	cpe:2.3:o:suse:linux_enterprise:11.0:sp1::::::
	cpe:2.3:o:suse:linux_enterprise:12.0:::::::*
	cpe:2.3:o:suse:linux_enterprise:15.0:::::::*

Configuration 5 (hide)

OR	cpe:2.3:a:opensuse:factory:-:::::::*
	cpe:2.3:o:opensuse:leap:15.2:::::::*

Configuration 6 (hide)

OR	cpe:2.3:o:fedoraproject:fedora:34:::::::*
	cpe:2.3:o:fedoraproject:fedora:35:::::::*

History

21 Nov 2024, 06:26

Type	Values Removed	Values Added
References	~~() https://hackerone.com/reports/910552 - Permissions Required, Third Party Advisory~~	() https://hackerone.com/reports/910552 - Permissions Required, Third Party Advisory
References	~~() https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IUXQCH6FRKANCVZO2Q7D2SQX33FP3KWN/ -~~	() https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IUXQCH6FRKANCVZO2Q7D2SQX33FP3KWN/ -
References	~~() https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UTOJGS5IEFDK3UOO7IY4OTTFGHGLSWZF/ -~~	() https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UTOJGS5IEFDK3UOO7IY4OTTFGHGLSWZF/ -
References	~~() https://security.gentoo.org/glsa/202401-27 -~~	() https://security.gentoo.org/glsa/202401-27 -
References	~~() https://security.netapp.com/advisory/ntap-20220121-0003/ - Third Party Advisory~~	() https://security.netapp.com/advisory/ntap-20220121-0003/ - Third Party Advisory
References	~~() https://www.ruby-lang.org/en/news/2021/11/24/cookie-prefix-spoofing-in-cgi-cookie-parse-cve-2021-41819/ - Exploit, Vendor Advisory~~	() https://www.ruby-lang.org/en/news/2021/11/24/cookie-prefix-spoofing-in-cgi-cookie-parse-cve-2021-41819/ - Exploit, Vendor Advisory

24 Jan 2024, 05:15

Type	Values Removed	Values Added
References		() https://security.gentoo.org/glsa/202401-27 -

07 Nov 2023, 03:39

Type	Values Removed	Values Added
References	{'url': 'https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UTOJGS5IEFDK3UOO7IY4OTTFGHGLSWZF/', 'name': 'FEDORA-2022-8cf0124add', 'tags': ['Mailing List', 'Third Party Advisory'], 'refsource': 'FEDORA'} {'url': 'https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/IUXQCH6FRKANCVZO2Q7D2SQX33FP3KWN/', 'name': 'FEDORA-2022-82a9edac27', 'tags': ['Mailing List', 'Third Party Advisory'], 'refsource': 'FEDORA'}	() https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IUXQCH6FRKANCVZO2Q7D2SQX33FP3KWN/ - () https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UTOJGS5IEFDK3UOO7IY4OTTFGHGLSWZF/ -

Information

Published : 2022-01-01 06:15

Updated : 2025-05-22 15:15

NVD link : CVE-2021-41819

Mitre link : CVE-2021-41819

CVE.ORG link : CVE-2021-41819

JSON object : View

Products Affected

redhat

software_collections
enterprise_linux

debian

debian_linux

suse

linux_enterprise

opensuse

leap
factory

ruby-lang

cgi
ruby

fedoraproject

fedora

CWE

CWE-565

Reliance on Cookies without Validation and Integrity Checking

{"id": "CVE-2021-41819", "cveTags": [], "metrics": {"cvssMetricV2": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"version": "2.0", "baseScore": 5.0, "accessVector": "NETWORK", "vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:N", "authentication": "NONE", "integrityImpact": "PARTIAL", "accessComplexity": "LOW", "availabilityImpact": "NONE", "confidentialityImpact": "NONE"}, "acInsufInfo": false, "impactScore": 2.9, "baseSeverity": "MEDIUM", "obtainAllPrivilege": false, "exploitabilityScore": 10.0, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 3.9}, {"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 3.9}]}, "published": "2022-01-01T06:15:07.293", "references": [{"url": "https://hackerone.com/reports/910552", "tags": ["Permissions Required", "Third Party Advisory"], "source": "cve@mitre.org"}, {"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IUXQCH6FRKANCVZO2Q7D2SQX33FP3KWN/", "source": "cve@mitre.org"}, {"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UTOJGS5IEFDK3UOO7IY4OTTFGHGLSWZF/", "source": "cve@mitre.org"}, {"url": "https://security.gentoo.org/glsa/202401-27", "source": "cve@mitre.org"}, {"url": "https://security.netapp.com/advisory/ntap-20220121-0003/", "tags": ["Third Party Advisory"], "source": "cve@mitre.org"}, {"url": "https://www.ruby-lang.org/en/news/2021/11/24/cookie-prefix-spoofing-in-cgi-cookie-parse-cve-2021-41819/", "tags": ["Exploit", "Vendor Advisory"], "source": "cve@mitre.org"}, {"url": "https://hackerone.com/reports/910552", "tags": ["Permissions Required", "Third Party Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IUXQCH6FRKANCVZO2Q7D2SQX33FP3KWN/", "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UTOJGS5IEFDK3UOO7IY4OTTFGHGLSWZF/", "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://security.gentoo.org/glsa/202401-27", "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://security.netapp.com/advisory/ntap-20220121-0003/", "tags": ["Third Party Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://www.ruby-lang.org/en/news/2021/11/24/cookie-prefix-spoofing-in-cgi-cookie-parse-cve-2021-41819/", "tags": ["Exploit", "Vendor Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-565"}]}, {"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "description": [{"lang": "en", "value": "CWE-565"}]}], "descriptions": [{"lang": "en", "value": "CGI::Cookie.parse in Ruby through 2.6.8 mishandles security prefixes in cookie names. This also affects the CGI gem through 0.3.0 for Ruby."}, {"lang": "es", "value": "CGI::Cookie.parse en Ruby versiones hasta 2.6.8, maneja inapropiadamente los prefijos de seguridad en los nombres de las cookies. Esto tambi\u00e9n afecta a CGI gem versiones hasta 0.3.0 para Ruby."}], "lastModified": "2025-05-22T15:15:54.060", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:ruby-lang:cgi:0.1.0:*:*:*:*:ruby:*:*", "vulnerable": true, "matchCriteriaId": "2DEC113F-FF5D-48DC-896B-E1C8A2C76C9C"}, {"criteria": "cpe:2.3:a:ruby-lang:cgi:0.2.0:*:*:*:*:ruby:*:*", "vulnerable": true, "matchCriteriaId": "59B7F28D-757D-429F-88B5-7A8DAFB9BB4C"}, {"criteria": "cpe:2.3:a:ruby-lang:cgi:0.3.0:*:*:*:*:ruby:*:*", "vulnerable": true, "matchCriteriaId": "C8CB09D2-66DD-4E05-B9FC-F1C632C6942F"}, {"criteria": "cpe:2.3:a:ruby-lang:ruby:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "64AC442C-39CB-477C-9356-F36AF6762E53", "versionEndIncluding": "2.6.8"}, {"criteria": "cpe:2.3:a:ruby-lang:ruby:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D7B53365-0B48-4408-A4A7-9A3744F89F07", "versionEndExcluding": "2.7.5", "versionStartIncluding": "2.7.0"}, {"criteria": "cpe:2.3:a:ruby-lang:ruby:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D4499575-33A0-47D7-A88B-0E6FD2340792", "versionEndExcluding": "3.0.3", "versionStartIncluding": "3.0.0"}], "operator": "OR"}]}, {"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:redhat:software_collections:-:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "749804DA-4B27-492A-9ABA-6BB562A6B3AC"}, {"criteria": "cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F4CFF558-3C47-480D-A2F0-BABF26042943"}], "operator": "OR"}]}, {"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "DEECE5FC-CACF-4496-A3E7-164736409252"}, {"criteria": "cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "07B237A9-69A3-4A9C-9DA0-4E06BD37AE73"}, {"criteria": "cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "FA6FEEC2-9F11-4643-8827-749718254FED"}], "operator": "OR"}]}, {"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:suse:linux_enterprise:11.0:sp1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "4500161F-13A0-4369-B93A-778B34E7F005"}, {"criteria": "cpe:2.3:o:suse:linux_enterprise:12.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "CBC8B78D-1131-4F21-919D-8AC79A410FB9"}, {"criteria": "cpe:2.3:o:suse:linux_enterprise:15.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "1607628F-77A7-4C1F-98DF-0DC50AE8627D"}], "operator": "OR"}]}, {"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:opensuse:factory:-:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E29492E1-43D8-43BF-94E3-26A762A66FAA"}, {"criteria": "cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "B009C22E-30A4-4288-BCF6-C3E81DEAF45A"}], "operator": "OR"}]}, {"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "A930E247-0B43-43CB-98FF-6CE7B8189835"}, {"criteria": "cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "80E516C0-98A4-4ADE-B69F-66A772E2BAAA"}], "operator": "OR"}]}], "sourceIdentifier": "cve@mitre.org"}

7.5 /10

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

5.0 /10

Access Vector NETWORK

Access Complexity LOW

Authentication NONE

Confidentiality Impact NONE

Integrity Impact PARTIAL

Availability Impact NONE

JSON object

Attach tags to CVE-2021-41819

7.5^/10

5.0^/10

Attach tags to `CVE-2021-41819`