CVE-2023-6992
Memory corruption issues is Cloudflare zlib implementation
- Published
- Updated
- Reserved
- Assigned by
- cloudflare
Description
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| cloudflareCNA (assigner) | 3.1 | Medium4.0 | CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L |
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.24% · top 85% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.0.
Weakness
- CWE-20 Improper Input Validation (opens in a new tab)All about CWE-20 and its CVEs
- CWE-122: Heap-based Buffer Overflow (opens in a new tab)All about CWE-122 and its CVEs
- CWE-126: Buffer Over-read (opens in a new tab)All about CWE-126 and its CVEs
- CWE-787 (opens in a new tab)All about CWE-787 and its CVEs
Affected products
- affected < 8352d10
References (2)
- https://github.com/cloudflare/zlib (opens in a new tab)productx_transferred
- https://github.com/cloudflare/zlib/security/advisories/GHSA-vww9-j87r-4cqh (opens in a new tab)vendor-advisoryx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2023-6992)Record last updated .