Vulnerability · Published Feb 26, 2021 · Assigned by mozilla
CVE-2021-23961
High 7.4
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)7.4High
Exploit odds (30 days)1.5%top 26.0% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
Further techniques that built on the slipstream research combined with a malicious webpage could have exposed both an internal network's hosts as well as services running on the user's local machine. This vulnerability affects Firefox < 85.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | firefox | 85.0-r0 | ALPINE-CVE-2021-23961 |
| Alpine:v3.21 | firefox | 85.0-r0 | ALPINE-CVE-2021-23961 |
| Alpine:v3.22 | firefox | 85.0-r0 | ALPINE-CVE-2021-23961 |
| Alpine:v3.23 | firefox | 85.0-r0 | ALPINE-CVE-2021-23961 |
| Alpine:v3.20 | firefox-esr | 78.10.0-r0 | ALPINE-CVE-2021-23961 |
| Alpine:v3.21 | firefox-esr | 78.10.0-r0 | ALPINE-CVE-2021-23961 |
| Alpine:v3.22 | firefox-esr | 78.10.0-r0 | ALPINE-CVE-2021-23961 |
| Alpine:v3.23 | firefox-esr | 78.10.0-r0 | ALPINE-CVE-2021-23961 |
| Alpine:v3.21 | librewolf | 85.0-r0 | ALPINE-CVE-2021-23961 |
| Alpine:v3.22 | librewolf | 85.0-r0 | ALPINE-CVE-2021-23961 |
| Alpine:v3.23 | librewolf | 85.0-r0 | ALPINE-CVE-2021-23961 |
| Alpine:v3.24 | librewolf | 85.0-r0 | ALPINE-CVE-2021-23961 |
| Alpine:v3.20 | thunderbird | 91.3.2-r0 | ALPINE-CVE-2021-23961 |
| Alpine:v3.21 | thunderbird | 91.3.2-r0 | ALPINE-CVE-2021-23961 |
| Alpine:v3.22 | thunderbird | 91.3.2-r0 | ALPINE-CVE-2021-23961 |
| Alpine:v3.23 | thunderbird | 91.3.2-r0 | ALPINE-CVE-2021-23961 |
| Debian:12 | firefox-esr | 78.10.0esr-1 | DEBIAN-CVE-2021-23961 |
| Debian:13 | firefox-esr | 78.10.0esr-1 | DEBIAN-CVE-2021-23961 |
| Debian:14 | firefox-esr | 78.10.0esr-1 | DEBIAN-CVE-2021-23961 |
| Debian:12 | thunderbird | 1:78.10.0-1 | DEBIAN-CVE-2021-23961 |
| Debian:13 | thunderbird | 1:78.10.0-1 | DEBIAN-CVE-2021-23961 |
| Debian:14 | thunderbird | 1:78.10.0-1 | DEBIAN-CVE-2021-23961 |
| Ubuntu:22.04:LTS | mozjs78 | no fix listed | UBUNTU-CVE-2021-23961 |
Affected products (as reported)
References
- https://www.mozilla.org/security/advisories/mfsa2021-03/ x_refsource_MISC
- https://bugzilla.mozilla.org/show_bug.cgi?id=1677940 x_refsource_MISC
- DSA-4895 vendor-advisory, x_refsource_DEBIAN
- [debian-lts-announce] 20210422 [SECURITY] [DLA 2632-1] thunderbird security update mailing-list, x_refsource_MLIST
- DSA-4897 vendor-advisory, x_refsource_DEBIAN
- [debian-lts-announce] 20210423 [SECURITY] [DLA 2633-1] firefox-esr security update mailing-list, x_refsource_MLIST
- GLSA-202104-10 vendor-advisory, x_refsource_GENTOO
- GLSA-202104-09 vendor-advisory, x_refsource_GENTOO