CVE-2021-41819

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

2.93% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 85.9% of scored records. A rank, not a probability.

NVD base score

7.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2022-01-01 00:00Z4 YR AGO

Last updated

2025-05-22 15:00Z1 YR AGO

Reserved

2021-09-29

Assigning CNA

mitre

Record state

PUBLISHED

Severity

High (CVSS 7.5)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Weaknesses

• CWE-565Reliance on Cookies without Validation and Integrity CheckingBase

Data version

5.1

Document digest

e7a3a5ff123aa15f8bab03f7b4a1e2c2fa2caaa426dcf750b721f70a94e114f7

• hackerone.comhttps://hackerone.com/reports/910552
• www.ruby-lang.orghttps://www.ruby-lang.org/en/news/2021/11/24/cookie-prefix-spoofing-in-cgi-cookie-parse-cve-2021-41819/
• security.netapp.comhttps://security.netapp.com/advisory/ntap-20220121-0003/
• lists.fedoraproject.orgFEDORA-2022-82a9edac27https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IUXQCH6FRKANCVZO2Q7D2SQX33FP3KWN/vendor-advisory
• lists.fedoraproject.orgFEDORA-2022-8cf0124addhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UTOJGS5IEFDK3UOO7IY4OTTFGHGLSWZF/vendor-advisory
• security.gentoo.orgGLSA-202401-27https://security.gentoo.org/glsa/202401-27vendor-advisory