CVE-2021-41084

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

1.23% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 66.9% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

NVD analysis status

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

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

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

2021-09-21 17:20Z4 YR AGO

Last updated

2024-08-04 02:59Z2 YR AGO

Reserved

2021-09-15

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

High (CVSS 8.7)

CNA CVSS vector

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

Weaknesses

• CWE-918Server-Side Request Forgery (SSRF)Base
• CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')Class

Data version

5.1

Document digest

22c96f9bd057b9166ff2db8749d8067016916520bf1cc9674c7ebf8e510cbfe2

• github.comhttps://github.com/http4s/http4s/security/advisories/GHSA-5vcm-3xc3-w7x3x_refsource_CONFIRM
• github.comhttps://github.com/http4s/http4s/commit/d02007db1da4f8f3df2dbf11f1db9ac7afc3f9d8x_refsource_MISC
• httpwg.orghttps://httpwg.org/http-core/draft-ietf-httpbis-semantics-latest.html#fields.valuesx_refsource_MISC
• owasp.orghttps://owasp.org/www-community/attacks/HTTP_Response_Splittingx_refsource_MISC