Vulnerability · Published Aug 17, 2021 · Assigned by mozilla
CVE-2021-29982
Medium 6.5
In plain English
A medium-severity security flaw in Firefox from Mozilla. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.1% (higher than 66% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)6.5Medium
Exploit odds (30 days)1.1%top 33.6% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | firefox | 92.0.1-r0 | ALPINE-CVE-2021-29982 |
| Alpine:v3.21 | firefox | 92.0.1-r0 | ALPINE-CVE-2021-29982 |
| Alpine:v3.22 | firefox | 92.0.1-r0 | ALPINE-CVE-2021-29982 |
| Alpine:v3.23 | firefox | 92.0.1-r0 | ALPINE-CVE-2021-29982 |
| Alpine:v3.21 | librewolf | 92.0.1-r0 | ALPINE-CVE-2021-29982 |
| Alpine:v3.22 | librewolf | 92.0.1-r0 | ALPINE-CVE-2021-29982 |
| Alpine:v3.23 | librewolf | 92.0.1-r0 | ALPINE-CVE-2021-29982 |
| Alpine:v3.24 | librewolf | 92.0.1-r0 | ALPINE-CVE-2021-29982 |
| Alpine:v3.20 | thunderbird | 91.3.2-r0 | ALPINE-CVE-2021-29982 |
| Alpine:v3.21 | thunderbird | 91.3.2-r0 | ALPINE-CVE-2021-29982 |
| Alpine:v3.22 | thunderbird | 91.3.2-r0 | ALPINE-CVE-2021-29982 |
| Alpine:v3.23 | thunderbird | 91.3.2-r0 | ALPINE-CVE-2021-29982 |
| Ubuntu:22.04:LTS | mozjs78 | no fix listed | UBUNTU-CVE-2021-29982 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | unspecified – before 91 |
| Mozilla | Thunderbird | unspecified – before 91 |
References
- https://www.mozilla.org/security/advisories/mfsa2021-33/ x_refsource_MISC
- https://www.mozilla.org/security/advisories/mfsa2021-36/ x_refsource_MISC
- https://bugzilla.mozilla.org/show_bug.cgi?id=1715318 x_refsource_MISC
- GLSA-202202-03 vendor-advisory, x_refsource_GENTOO