CVE-2025-0247
published 2025-01-07CVE-2025-0247: Memory safety bugs present in Firefox 133 and Thunderbird 133. Some of these bugs showed evidence of memory corruption and we presume that with enough effort…
PriorityP354critical9.8CVSS 3.1
AVNACLPRNUINSUCHIHAH
EPSS
10.61%
95.8th percentile
Memory safety bugs present in Firefox 133 and Thunderbird 133. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 134 and Thunderbird 134.
Affected
6 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | firefox | < firefox 134.0-1 (sid) | firefox 134.0-1 (sid) |
| mozilla | firefox | < 134.0 | 134.0 |
| mozilla | firefox | — | — |
| mozilla | firefox | >= 0 < 134.0+build1-0ubuntu0.20.04.1 | 134.0+build1-0ubuntu0.20.04.1 |
| mozilla | thunderbird | < 134.0 | 134.0 |
| mozilla | thunderbird | >= 0 < 1:140.7.1+build1-0ubuntu0.22.04.1 | 1:140.7.1+build1-0ubuntu0.22.04.1 |
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
vendor_ubuntu5.4MEDIUM
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Ubuntu
Thunderbird vulnerabilities
vendor_ubuntu·2026-02-02
CVE-2025-8031 Thunderbird vulnerabilities
Title: Thunderbird vulnerabilities
Summary: Several security issues were fixed in Thunderbird.
Multiple security issues were discovered in Thunderbird. If a user were
tricked into opening a specially crafted website in a browsing context,
an attacker could potentially exploit these to cause a denial of service,
obtain sensitive information, bypass security restrictions, cross-site
tracing, or execute arbitrary code.
Instructions: In general, a standard system update will make all the necessary changes.
Ubuntu
Firefox vulnerabilities
vendor_ubuntu·2025-01-09·CVSS 5.4
CVE-2025-0240 [MEDIUM] Firefox vulnerabilities
Title: Firefox vulnerabilities
Summary: Several security issues were fixed in Firefox.
Multiple security issues were discovered in Firefox. If a user were
tricked into opening a specially crafted website, an attacker could
potentially exploit these to cause a denial of service, obtain sensitive
information across domains, or execute arbitrary code. (CVE-2025-0237,
CVE-2025-0239, CVE-2025-0240, CVE-2025-0242, CVE-2025-0243, CVE-2025-0247)
Irvan Kurniawan discovered that Firefox incorrectly handled memory when
breaking lines in text, leading to a use-after-free vulnerability. An
attacker could possibly use this issue to cause a denial of service or
possibly execute arbitrary code. (CVE-2025-0238)
Nils Bars discovered that Firefox incorrectly handled memory when using
JavaScript Text Segm
Red Hat
firefox: thunderbird: Memory safety bugs fixed in Firefox 134 and Thunderbird 134
vendor_redhat·2025-01-07·CVSS 9.8
CVE-2025-0247 [CRITICAL] CWE-120 firefox: thunderbird: Memory safety bugs fixed in Firefox 134 and Thunderbird 134
firefox: thunderbird: Memory safety bugs fixed in Firefox 134 and Thunderbird 134
Memory safety bugs present in Firefox 133 and Thunderbird 133. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 134 and Thunderbird < 134.
The Mozilla Foundation's Security Advisory: Memory safety bugs are present in Firefox 133 and Thunderbird 133. Some of these bugs show evidence of memory corruption, and with enough effort, some of these could be exploited to run arbitrary code.
Statement: Red Hat Product Security rates this flaw as determined by the Mozilla Foundation Security Advisory.
Package: firefox (Red Hat Enterprise Linux 10) - Fix deferred
Package:
Debian
CVE-2025-0247: firefox - Memory safety bugs present in Firefox 133 and Thunderbird 133. Some of these bug...
vendor_debian·2025·CVSS 9.8
CVE-2025-0247 [CRITICAL] CVE-2025-0247: firefox - Memory safety bugs present in Firefox 133 and Thunderbird 133. Some of these bug...
Memory safety bugs present in Firefox 133 and Thunderbird 133. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 134 and Thunderbird < 134.
Scope: local
sid: resolved (fixed in 134.0-1)
Mozilla
Mozilla Foundation Security Advisory 2025-04: CVE-2025-0247
vendor_mozilla·CVSS 9.8
CVE-2025-0247 [CRITICAL] Mozilla Foundation Security Advisory 2025-04: CVE-2025-0247
Mozilla Foundation Security Advisory 2025-04
CVE: CVE-2025-0247
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 134
Mozilla
Mozilla Foundation Security Advisory 2025-01: CVE-2025-0247
vendor_mozilla·CVSS 9.8
CVE-2025-0247 [CRITICAL] Mozilla Foundation Security Advisory 2025-01: CVE-2025-0247
Mozilla Foundation Security Advisory 2025-01
CVE: CVE-2025-0247
Product: Firefox
Impact: high
Fixed in: Firefox 134
VulDB
Mozilla Thunderbird up to 132.x memory corruption (Nessus ID 213603)
vuldb·2026-09-30·CVSS 9.8
CVE-2025-0247 [CRITICAL] Mozilla Thunderbird up to 132.x memory corruption (Nessus ID 213603)
A vulnerability, which was classified as critical, has been found in Mozilla Thunderbird up to 132.x. Impacted is an unknown function. The manipulation leads to memory corruption.
This vulnerability is traded as CVE-2025-0247. It is possible to initiate the attack remotely. There is no exploit available.
It is advisable to upgrade the affected component.
VulDB
Mozilla Firefox up to 132.x memory corruption (Nessus ID 213603)
vuldb·2026-09-30·CVSS 9.8
CVE-2025-0247 [CRITICAL] Mozilla Firefox up to 132.x memory corruption (Nessus ID 213603)
A vulnerability classified as critical was found in Mozilla Firefox up to 132.x. This issue affects some unknown processing. Executing a manipulation can lead to memory corruption.
This vulnerability appears as CVE-2025-0247. The attack may be performed from remote. There is no available exploit.
Upgrading the affected component is advised.
OSV
firefox vulnerabilities
osv·2025-01-09·CVSS 5.4
CVE-2025-0237 [MEDIUM] firefox vulnerabilities
firefox vulnerabilities
Multiple security issues were discovered in Firefox. If a user were
tricked into opening a specially crafted website, an attacker could
potentially exploit these to cause a denial of service, obtain sensitive
information across domains, or execute arbitrary code. (CVE-2025-0237,
CVE-2025-0239, CVE-2025-0240, CVE-2025-0242, CVE-2025-0243, CVE-2025-0247)
Irvan Kurniawan discovered that Firefox incorrectly handled memory when
breaking lines in text, leading to a use-after-free vulnerability. An
attacker could possibly use this issue to cause a denial of service or
possibly execute arbitrary code. (CVE-2025-0238)
Nils Bars discovered that Firefox incorrectly handled memory when using
JavaScript Text Segmentation. An attacker could possibly use this issue to
cause a d
OSV
CVE-2025-0247: Memory safety bugs present in Firefox 133 and Thunderbird 133
osv·2025-01-07·CVSS 9.8
CVE-2025-0247 [CRITICAL] CVE-2025-0247: Memory safety bugs present in Firefox 133 and Thunderbird 133
Memory safety bugs present in Firefox 133 and Thunderbird 133. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 134 and Thunderbird < 134.
GHSA
GHSA-24v2-mrj2-4wpc: Memory safety bugs present in Firefox 133 and Thunderbird 133
ghsa_unreviewed·2025-01-07
CVE-2025-0247 [HIGH] CWE-787 GHSA-24v2-mrj2-4wpc: Memory safety bugs present in Firefox 133 and Thunderbird 133
Memory safety bugs present in Firefox 133 and Thunderbird 133. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 134.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2025-0247 firefox: thunderbird: Memory safety bugs fixed in Firefox 134 and Thunderbird 134
bugzilla·2025-01-07·CVSS 9.8
CVE-2025-0247 [CRITICAL] CVE-2025-0247 firefox: thunderbird: Memory safety bugs fixed in Firefox 134 and Thunderbird 134
CVE-2025-0247 firefox: thunderbird: Memory safety bugs fixed in Firefox 134 and Thunderbird 134
Memory safety bugs present in Firefox 133 and Thunderbird 133. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 134.
Checkpoint
13th January – Threat Intelligence Report
blogs_checkpoint·2025-01-13
CVE-2025-0242 13th January – Threat Intelligence Report
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2025-01-07
Published