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)
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.002 (13.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 13th percentile — 13.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- Cloudflare Zlib — versions 0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/cloudflare/zlib (Product, product)
- github.com/cloudflare/zlib/security/advisories/GHSA-vww9-j87r-4cqh (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.