Vulnerability · Published Jun 24, 2021 · Assigned by mozilla
CVE-2021-29964
High 7.1
In plain English
A high-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 0.8% (higher than 57% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)7.1High
Exploit odds (30 days)0.8%top 42.7% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
A locally-installed hostile program could send `WM_COPYDATA` messages that Firefox would process incorrectly, leading to an out-of-bounds read. *This bug only affects Firefox on Windows. Other operating systems are unaffected.*. This vulnerability affects Thunderbird < 78.11, Firefox < 89, and Firefox ESR < 78.11.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | thunderbird | 91.3.2-r0 | ALPINE-CVE-2021-29964 |
| Alpine:v3.21 | thunderbird | 91.3.2-r0 | ALPINE-CVE-2021-29964 |
| Alpine:v3.22 | thunderbird | 91.3.2-r0 | ALPINE-CVE-2021-29964 |
| Alpine:v3.23 | thunderbird | 91.3.2-r0 | ALPINE-CVE-2021-29964 |
| Ubuntu:22.04:LTS | mozjs78 | no fix listed | UBUNTU-CVE-2021-29964 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Thunderbird | unspecified – before 78.11 |
| Mozilla | Firefox | unspecified – before 89 |
| Mozilla | Firefox ESR | unspecified – before 78.11 |
References
- https://www.mozilla.org/security/advisories/mfsa2021-26/ x_refsource_MISC
- https://www.mozilla.org/security/advisories/mfsa2021-24/ x_refsource_MISC
- https://www.mozilla.org/security/advisories/mfsa2021-23/ x_refsource_MISC
- https://bugzilla.mozilla.org/show_bug.cgi?id=1706501 x_refsource_MISC