CVE-2025-11721
published 2025-10-14CVE-2025-11721: Memory safety bug present in Firefox 143 and Thunderbird 143. This bug showed evidence of memory corruption and we presume that with enough effort this could…
PriorityP348critical9.8CVSS 3.1
AVNACLPRNUINSUCHIHAH
EPSS
0.34%
26.2th percentile
Memory safety bug present in Firefox 143 and Thunderbird 143. This bug showed evidence of memory corruption and we presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 144 and Thunderbird 144.
Affected
4 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | firefox | < firefox 144.0-1 (sid) | firefox 144.0-1 (sid) |
| mozilla | firefox | — | — |
| mozilla | firefox | >= 143.0 < 144.0 | 144.0 |
| mozilla | thunderbird | >= 143.0 < 144.0 | 144.0 |
CVSS provenance
nvdv3.19.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
osv9.8CRITICAL
vendor_debian9.8CRITICAL
vendor_redhat9.8CRITICAL
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Red Hat
thunderbird: firefox: Memory safety bug fixed in Firefox 144 and Thunderbird 144
vendor_redhat·2025-10-14·CVSS 9.8
CVE-2025-11721 [CRITICAL] CWE-119 thunderbird: firefox: Memory safety bug fixed in Firefox 144 and Thunderbird 144
thunderbird: firefox: Memory safety bug fixed in Firefox 144 and Thunderbird 144
Memory safety bug present in Firefox 143 and Thunderbird 143. This bug showed evidence of memory corruption and we presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability affects Firefox < 144 and Thunderbird < 144.
A flaw was found in Thunderbird and Firefox. The Mozilla Foundation's Security Advisory describes the following issue:
Memory safety bug present in Firefox 143 and Thunderbird 143. This bug showed evidence of memory corruption and we presume that with enough effort this could have been exploited to run arbitrary code.
Statement: Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.
Pac
Debian
CVE-2025-11721: firefox - Memory safety bug present in Firefox 143 and Thunderbird 143. This bug showed ev...
vendor_debian·2025·CVSS 9.8
CVE-2025-11721 [CRITICAL] CVE-2025-11721: firefox - Memory safety bug present in Firefox 143 and Thunderbird 143. This bug showed ev...
Memory safety bug present in Firefox 143 and Thunderbird 143. This bug showed evidence of memory corruption and we presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability affects Firefox < 144 and Thunderbird < 144.
Scope: local
sid: resolved (fixed in 144.0-1)
Mozilla
Mozilla Foundation Security Advisory 2025-84: CVE-2025-11721
vendor_mozilla·CVSS 9.8
CVE-2025-11721 [CRITICAL] Mozilla Foundation Security Advisory 2025-84: CVE-2025-11721
Mozilla Foundation Security Advisory 2025-84
CVE: CVE-2025-11721
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 144
Mozilla
Mozilla Foundation Security Advisory 2025-81: CVE-2025-11721
vendor_mozilla·CVSS 9.8
CVE-2025-11721 [CRITICAL] Mozilla Foundation Security Advisory 2025-81: CVE-2025-11721
Mozilla Foundation Security Advisory 2025-81
CVE: CVE-2025-11721
Product: Firefox
Impact: high
Fixed in: Firefox 144
OSV
CVE-2025-11721: Memory safety bug present in Firefox 143 and Thunderbird 143
osv·2025-10-14·CVSS 9.8
CVE-2025-11721 [CRITICAL] CVE-2025-11721: Memory safety bug present in Firefox 143 and Thunderbird 143
Memory safety bug present in Firefox 143 and Thunderbird 143. This bug showed evidence of memory corruption and we presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability affects Firefox < 144 and Thunderbird < 144.
GHSA
GHSA-r25g-xjc5-pcrv: Memory safety bug present in Firefox 143 and Thunderbird 143
ghsa_unreviewed·2025-10-14
CVE-2025-11721 [CRITICAL] CWE-119 GHSA-r25g-xjc5-pcrv: Memory safety bug present in Firefox 143 and Thunderbird 143
Memory safety bug present in Firefox 143 and Thunderbird 143. This bug showed evidence of memory corruption and we presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability affects Firefox < 144 and Thunderbird < 144.
No detection rules found.
No public exploits indexed.
2025-10-14
Published