What is CVE-2023-6992?

CVE-2023-6992 is a medium-severity vulnerability in Cloudflare Zlib, classified under Improper Input Validation. CVSS score: 4.0/10. Published 2024-01-04.

How severe is CVE-2023-6992?

Medium severity. CVSS v3 base score is 4.0 out of 10.

Is CVE-2023-6992 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Cloudflare Zlib

CVE-2023-6992

Cloudflare version of zlib library was found to be vulnerable to memory corruption issues affecting the deflation algorithm implementation (deflate.c). The issues resulted from improper input validation and heap-based buffer overflow. A local attacker could exploit the problem during compression using a crafted malicious file potentially leading to denial of service of the software. Patches: The issue has been patched in commit 8352d10 https://github.com/cloudflare/zlib/commit/8352d108c05db1bdc5ac3bdf834dad641694c13c . The upstream repository is not affected.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

EPSS: 0.002 (14.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.0 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L.

Affected products

Cloudflare Zlib — versions 0

Weakness classification (CWE)

Public proof-of-concept exploits

ChrisAdkin8/Nomad-Job-Vulnerability-Tagging

References

cna@cloudflare.com (Product, product)
cna@cloudflare.com (vendor-advisory, Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2023-6992?: CVE-2023-6992 is a medium-severity vulnerability in Cloudflare Zlib, classified under Improper Input Validation. CVSS score: 4.0/10. Published 2024-01-04.
How severe is CVE-2023-6992?: Medium severity. CVSS v3 base score is 4.0 out of 10.
Is CVE-2023-6992 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.