CVE-2023-6992

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

0.23% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 14.3% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

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

2024-01-04 11:11Z2 YR AGO

Last updated

2024-09-06 18:16Z2 YR AGO

Reserved

2023-12-20

Assigning CNA

cloudflare

Record state

PUBLISHED

Severity

Medium (CVSS 4.0)

CNA CVSS vector

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

Weaknesses

• CWE-20Improper Input ValidationClass
• CWE-122Heap-based Buffer OverflowVariant
• CWE-126Buffer Over-readVariant
• CWE-787Out-of-bounds WriteBase

Data version

5.1

Document digest

d7a231f8d9f12a521d2a63f6fdab5cb88cd0936e4377e7be2afc8b046d1cae1c

• github.comhttps://github.com/cloudflare/zlibproduct
• github.comhttps://github.com/cloudflare/zlib/security/advisories/GHSA-vww9-j87r-4cqhvendor-advisory