CVE-2023-27491

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• 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

0.87% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 56.2% of scored records. A rank, not a probability.

NVD base score

9.1 (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:H/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

2023-04-04 18:18Z3 YR AGO

Last updated

2025-02-11 16:14Z1 YR AGO

Reserved

2023-03-01

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

Medium (CVSS 5.4)

CNA CVSS vector

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

Weaknesses

• CWE-20Improper Input ValidationClass
• CWE-444Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')Base

Data version

5.1

Document digest

d783b8c90d2d249f44ad4fa80c85649c2de6e286edb9cb008e2e2205937279ac

• github.comhttps://github.com/envoyproxy/envoy/security/advisories/GHSA-5jmv-cw9p-f9rpx_refsource_CONFIRM
• datatracker.ietf.orghttps://datatracker.ietf.org/doc/html/rfc9113#section-8.3x_refsource_MISC
• datatracker.ietf.orghttps://datatracker.ietf.org/doc/html/rfc9114#section-4.3.1x_refsource_MISC
• www.rfc-editor.orghttps://www.rfc-editor.org/rfc/rfc9110#section-5.6.2x_refsource_MISC