Vulnerability in Mozilla Firefox
CVE-2021-29982
Due to incorrect JIT optimization, we incorrectly interpreted data from the wrong type of object, resulting in the potential leak of a single bit of memory. This vulnerability affects Firefox < 91 and Thunderbird < 91.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.011 (66.0th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 66th percentile — 66.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000
Affected products
- Mozilla Firefox — versions unspecified
- Mozilla Thunderbird — versions unspecified
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.mozilla.org/security/advisories/mfsa2021-33/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2021-36/ (Vendor Advisory)
- bugzilla.mozilla.org/show_bug.cgi (Exploit, Issue Tracking, Vendor Advisory)
- security.gentoo.org/glsa/202202-03 (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-29982?
- CVE-2021-29982 is a medium-severity vulnerability in Mozilla Firefox, classified under Missing Release of Resource after Effective Lifetime. CVSS score: 6.5/10. Published 2021-08-17.
- How severe is CVE-2021-29982?
- Medium severity. CVSS v3 base score is 6.5 out of 10.
- Is CVE-2021-29982 known to be exploited?
- 5 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.