Buffer overflow in Mozilla Firefox
CVE-2020-6831
A buffer overflow could occur when parsing and validating SCTP chunks in WebRTC. This could have led to memory corruption and a potentially exploitable crash. This vulnerability affects Firefox ESR < 68.8, Firefox < 76, and Thunderbird < 68.8.0.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.058 (92.9th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 93rd percentile — 92.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.058 · newest: 0.058 · change: 0.000
Affected products
- Mozilla Firefox — versions unspecified
- Mozilla Firefox Esr — versions unspecified
- Mozilla Firefox Esr
- Mozilla Thunderbird — versions unspecified
- Canonical Ubuntu Linux — versions 16.04, 18.04, 19.10
- Debian Linux — versions 9.0, 10.0
- openSUSE Leap — versions 15.2
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.mozilla.org/security/advisories/mfsa2020-18/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2020-16/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2020-17/ (Vendor Advisory)
- bugzilla.mozilla.org/show_bug.cgi (Permissions Required)
- usn.ubuntu.com/4373-1/ (vendor-advisory, Third Party Advisory)
- security.gentoo.org/glsa/202005-03 (Patch, Third Party Advisory)
- security.gentoo.org/glsa/202005-04 (Third Party Advisory)
- www.debian.org/security/2020/dsa-4714 (vendor-advisory, Third Party Advisory)
- lists.opensuse.org/opensuse-security-announce/2020-07/msg00000.html (vendor-advisory, Mailing List, Third Party Advisory)
- packetstormsecurity.com/files/158480/usrsctp-Stack-Buffer-Overflow.html (VDB Entry, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-6831?
- CVE-2020-6831 is a critical-severity vulnerability in Mozilla Firefox, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2020-05-26.
- How severe is CVE-2020-6831?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2020-6831 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.