Vulnerability in Apple macOS
CVE-2023-6857
When resolving a symlink, a race may occur where the buffer passed to `readlink` may actually be smaller than necessary. *This bug only affects Firefox on Unix-based operating systems (Android, Linux, MacOS). Windows is unaffected.* This vulnerability affects Firefox ESR < 115.6, Thunderbird < 115.6, and Firefox < 121.
Vulnerability class: Race Condition
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.007 (50.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 50.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
- Apple macOS
- Google Android
- Linux Kernel
- Mozilla Firefox — versions unspecified
- Mozilla Firefox Esr — versions unspecified
- Mozilla Firefox Esr
- Mozilla Thunderbird — versions unspecified
- Debian Linux — versions 10.0, 11.0, 12.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- bugzilla.mozilla.org/show_bug.cgi (Permissions Required, Issue Tracking)
- www.mozilla.org/security/advisories/mfsa2023-54/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2023-55/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2023-56/ (Vendor Advisory)
- www.debian.org/security/2023/dsa-5581 (Third Party Advisory)
- www.debian.org/security/2023/dsa-5582 (Third Party Advisory)
- lists.debian.org/debian-lts-announce/2023/12/msg00020.html (Mailing List, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2023/12/msg00021.html (Mailing List, Third Party Advisory)
- security.gentoo.org/glsa/202401-10 (Third Party Advisory)
Frequently asked questions
- What is CVE-2023-6857?
- CVE-2023-6857 is a medium-severity vulnerability in Apple macOS, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 5.3/10. Published 2023-12-19.
- How severe is CVE-2023-6857?
- Medium severity. CVSS v3 base score is 5.3 out of 10.
- Is CVE-2023-6857 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.