CVE-2025-1011: A bug in WebAssembly code generation could result in a crash
A bug in WebAssembly code generation could have lead to a crash. It may have been possible for an attacker to leverage this to achieve code execution. This vulnerability was fixed in Firefox 135, Firefox ESR 128.7, Thunderbird 128.7, and Thunderbird 135.
Other sources
A bug in WebAssembly code generation could have lead to a crash. It may have been possible for an attacker to leverage this to achieve code execution. This vulnerability affects Firefox < 135, Firefox ESR < 128.7, Thunderbird < 128.7, and Thunderbird < 135.
— Red Hat
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Firefoxto a version that resolves this vulnerability.Fixed in 135 - Upgrade
Upgrade
Firefox ESRto a version that resolves this vulnerability.Fixed in 128.7 - Upgrade
Upgrade
Thunderbirdto a version that resolves this vulnerability.Fixed in 135 - Upgrade
Upgrade
ubuntu/firefoxto a version that resolves this vulnerability.Fixed in 135.0+build2-0ubuntu0.20.04.1 - Upgrade
Upgrade
ubuntu/thunderbirdto a version that resolves this vulnerability.Fixed in 1:128.12.0+build1-0ubuntu0.22.04.1 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 128.7 - Upgrade
Upgrade
debian/firefoxto a version that resolves this vulnerability.Fixed in 159.0-1 - Upgrade
Upgrade
debian/firefox-esrto a version that resolves this vulnerability.Fixed in 140.12.0esr-1~deb12u1Fixed in 153.6.0esr-1~deb12u2Fixed in 140.15.0esr-1~deb13u1Fixed in 153.6.0esr-1~deb13u1Fixed in 153.5.1esr-1Fixed in 153.6.0esr-1 - Upgrade
Upgrade
debian/thunderbirdto a version that resolves this vulnerability.Fixed in 1:140.12.0esr-1~deb12u1Fixed in 1:153.6.0esr-1~deb12u1Fixed in 1:140.12.0esr-1~deb13u1Fixed in 1:153.5.1esr-1~deb13u2Fixed in 1:153.5.0esr-1Fixed in 1:153.6.0esr-1 - Upgrade
Upgrade
Thunderbirdto a version that resolves this vulnerability.Fixed in 128.7
Event History
Parent advisories
This vulnerability appears in the following advisories.
Peer vulnerabilities
Found alongside the following vulnerabilities.
Frequently Asked Questions
What is the severity of CVE-2025-1011?
CVE-2025-1011 has a high severity rating due to its potential for code execution via a bug in WebAssembly.
How do I fix CVE-2025-1011?
To fix CVE-2025-1011, update Mozilla Thunderbird or Firefox to versions above 128.7 or 135, as applicable.
What software is affected by CVE-2025-1011?
CVE-2025-1011 affects Mozilla Thunderbird, Firefox, and Firefox ESR versions up to 128.7 and 135.
Can CVE-2025-1011 cause system crashes?
Yes, CVE-2025-1011 can lead to crashes due to a bug in WebAssembly code generation.
Is it possible to exploit CVE-2025-1011 remotely?
Yes, an attacker may be able to exploit CVE-2025-1011 remotely to achieve code execution.