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CVE-2023-6992

Memory corruption issues is Cloudflare zlib implementation

MEDIUM
5.5
CVSS Score
Published: January 4, 2024 at 11:11 AM UTC
Updated: June 17, 2026 at 06:51 AM UTC
1 product affected across 1 vendorZlib

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Severity
MEDIUM5.5
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Zlib· Cloudflare
95%
v < 2023-11-16v < 8352d10
Affected range stops below 2023-11-16, so it looks safe — our inference, not a vendor statement
Affected range stops below 8352d10, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

Product
Source: [email protected]
https://github.com/cloudflare/zlib
Vendor AdvisoryPatchThird Party Advisory
Source: [email protected]
https://github.com/cloudflare/zlib/security/advisories/GHSA-vww9-j87r-4cqh

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.5MEDIUM[email protected]
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-20CWE-122CWE-126CWE-787

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