Vulnerability · Published Jun 24, 2021 · Assigned by mozilla
CVE-2021-29945
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 1.2% (higher than 68% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)6.5Medium
Exploit odds (30 days)1.2%top 31.6% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
The WebAssembly JIT could miscalculate the size of a return type, which could lead to a null read and result in a crash. *Note: This issue only affected x86-32 platforms. Other platforms are unaffected.*. This vulnerability affects Firefox ESR < 78.10, Thunderbird < 78.10, and Firefox < 88.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | firefox | 88.0-r0 | ALPINE-CVE-2021-29945 |
| Alpine:v3.21 | firefox | 88.0-r0 | ALPINE-CVE-2021-29945 |
| Alpine:v3.22 | firefox | 88.0-r0 | ALPINE-CVE-2021-29945 |
| Alpine:v3.23 | firefox | 88.0-r0 | ALPINE-CVE-2021-29945 |
| Alpine:v3.20 | firefox-esr | 78.10.0-r0 | ALPINE-CVE-2021-29945 |
| Alpine:v3.21 | firefox-esr | 78.10.0-r0 | ALPINE-CVE-2021-29945 |
| Alpine:v3.22 | firefox-esr | 78.10.0-r0 | ALPINE-CVE-2021-29945 |
| Alpine:v3.23 | firefox-esr | 78.10.0-r0 | ALPINE-CVE-2021-29945 |
| Alpine:v3.21 | librewolf | 88.0-r0 | ALPINE-CVE-2021-29945 |
| Alpine:v3.22 | librewolf | 88.0-r0 | ALPINE-CVE-2021-29945 |
| Alpine:v3.23 | librewolf | 88.0-r0 | ALPINE-CVE-2021-29945 |
| Alpine:v3.24 | librewolf | 88.0-r0 | ALPINE-CVE-2021-29945 |
| Alpine:v3.20 | thunderbird | 91.3.2-r0 | ALPINE-CVE-2021-29945 |
| Alpine:v3.21 | thunderbird | 91.3.2-r0 | ALPINE-CVE-2021-29945 |
| Alpine:v3.22 | thunderbird | 91.3.2-r0 | ALPINE-CVE-2021-29945 |
| Alpine:v3.23 | thunderbird | 91.3.2-r0 | ALPINE-CVE-2021-29945 |
| Debian:12 | firefox-esr | 78.10.0esr-1 | DEBIAN-CVE-2021-29945 |
| Debian:13 | firefox-esr | 78.10.0esr-1 | DEBIAN-CVE-2021-29945 |
| Debian:14 | firefox-esr | 78.10.0esr-1 | DEBIAN-CVE-2021-29945 |
| Debian:12 | thunderbird | 1:78.10.0-1 | DEBIAN-CVE-2021-29945 |
| Debian:13 | thunderbird | 1:78.10.0-1 | DEBIAN-CVE-2021-29945 |
| Debian:14 | thunderbird | 1:78.10.0-1 | DEBIAN-CVE-2021-29945 |
| Ubuntu:22.04:LTS | mozjs78 | no fix listed | UBUNTU-CVE-2021-29945 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox ESR | unspecified – before 78.10 |
| Mozilla | Thunderbird | unspecified – before 78.10 |
| Mozilla | Firefox | unspecified – before 88 |
References
- https://www.mozilla.org/security/advisories/mfsa2021-14/ x_refsource_MISC
- https://www.mozilla.org/security/advisories/mfsa2021-16/ x_refsource_MISC
- https://www.mozilla.org/security/advisories/mfsa2021-15/ x_refsource_MISC
- https://bugzilla.mozilla.org/show_bug.cgi?id=1700690 x_refsource_MISC