Vulnerability · Published Nov 3, 2021 · Assigned by mozilla
CVE-2021-38498
High 7.5
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 1.5% (higher than 74% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)7.5High
Exploit odds (30 days)1.5%top 26.2% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
During process shutdown, a document could have caused a use-after-free of a languages service object, leading to memory corruption and a potentially exploitable crash. This vulnerability affects Firefox < 93, Thunderbird < 91.2, and Firefox ESR < 91.2.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | firefox | 93.0-r0 | ALPINE-CVE-2021-38498 |
| Alpine:v3.21 | firefox | 93.0-r0 | ALPINE-CVE-2021-38498 |
| Alpine:v3.22 | firefox | 93.0-r0 | ALPINE-CVE-2021-38498 |
| Alpine:v3.23 | firefox | 93.0-r0 | ALPINE-CVE-2021-38498 |
| Alpine:v3.20 | firefox-esr | 91.2.0-r0 | ALPINE-CVE-2021-38498 |
| Alpine:v3.21 | firefox-esr | 91.2.0-r0 | ALPINE-CVE-2021-38498 |
| Alpine:v3.22 | firefox-esr | 91.2.0-r0 | ALPINE-CVE-2021-38498 |
| Alpine:v3.23 | firefox-esr | 91.2.0-r0 | ALPINE-CVE-2021-38498 |
| Alpine:v3.21 | librewolf | 93.0-r0 | ALPINE-CVE-2021-38498 |
| Alpine:v3.22 | librewolf | 93.0-r0 | ALPINE-CVE-2021-38498 |
| Alpine:v3.23 | librewolf | 93.0-r0 | ALPINE-CVE-2021-38498 |
| Alpine:v3.24 | librewolf | 93.0-r0 | ALPINE-CVE-2021-38498 |
| Alpine:v3.20 | thunderbird | 91.3.2-r0 | ALPINE-CVE-2021-38498 |
| Alpine:v3.21 | thunderbird | 91.3.2-r0 | ALPINE-CVE-2021-38498 |
| Alpine:v3.22 | thunderbird | 91.3.2-r0 | ALPINE-CVE-2021-38498 |
| Alpine:v3.23 | thunderbird | 91.3.2-r0 | ALPINE-CVE-2021-38498 |
| Rocky Linux:8 | firefox | 0:91.2.0-4.el8_4 | RLSA-2021:3755 |
| Rocky Linux:8 | thunderbird | 0:91.2.0-1.el8_4 | RLSA-2021:3838 |
| Ubuntu:22.04:LTS | mozjs78 | no fix listed | UBUNTU-CVE-2021-38498 |
| Ubuntu:22.04:LTS | thunderbird | 1:91.3.0+build2-0ubuntu1 | UBUNTU-CVE-2021-38498 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | unspecified – before 93 |
| Mozilla | Thunderbird | unspecified – before 91.2 |
| Mozilla | Firefox ESR | unspecified – before 91.2 |
References
- https://www.mozilla.org/security/advisories/mfsa2021-47/ x_refsource_MISC
- https://www.mozilla.org/security/advisories/mfsa2021-45/ x_refsource_MISC
- https://www.mozilla.org/security/advisories/mfsa2021-43/ x_refsource_MISC
- https://bugzilla.mozilla.org/show_bug.cgi?id=1729642 x_refsource_MISC