CVE-2020-26974: Use After Free
First published: Tue Dec 15 2020(Updated: )
When flex-basis was used on a table wrapper, a StyleGenericFlexBasis object could have been incorrectly cast to the wrong type. This resulted in a heap user-after-free, memory corruption, and a potentially exploitable crash.
Credit: security@mozilla.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Thunderbird | <78.6 | 78.6 |
| Firefox | <84.0 | |
| Firefox ESR | <78.6.0 | |
| Thunderbird | <78.6.0 | |
| Firefox | <84 | 84 |
| Firefox ESR | <78.6 | 78.6 |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
- https://bugzilla.mozilla.org/show_bug.cgi?id=1681022
- https://www.mozilla.org/en-US/security/advisories/mfsa2020-54/
- https://www.mozilla.org/en-US/security/advisories/mfsa2020-55/
- https://www.mozilla.org/en-US/security/advisories/mfsa2020-56/
- https://www.mozilla.org/security/advisories/mfsa2020-54/
- https://www.mozilla.org/security/advisories/mfsa2020-55/
- https://www.mozilla.org/security/advisories/mfsa2020-56/
Peer vulnerabilities
(Found alongside the following vulnerabilities)
Frequently Asked Questions
What is the severity of CVE-2020-26974?
CVE-2020-26974 is considered a critical vulnerability due to its potential for memory corruption and exploitable crashes.
How do I fix CVE-2020-26974?
To mitigate CVE-2020-26974, users should update Mozilla Firefox, Firefox ESR, or Thunderbird to versions 84 and 78.6 or later.
What types of software are affected by CVE-2020-26974?
CVE-2020-26974 affects Mozilla Firefox, Firefox ESR, and Thunderbird versions below specified thresholds.
Can CVE-2020-26974 lead to remote code execution?
While CVE-2020-26974 may cause a crash, it has not been confirmed to directly lead to remote code execution.
Is CVE-2020-26974 exploitable by attackers?
Yes, CVE-2020-26974 could potentially be exploited by attackers to cause crashes and disrupt service.
- agent/type
- agent/first-publish-date
- agent/references
- agent/author
- agent/severity
- agent/description
- collector/mitre-cve
- source/MITRE
- agent/weakness
- agent/last-modified-date
- agent/event
- agent/trending
- agent/source
- collector/mozilla-advisory
- source/Mozilla
- agent/software-canonical-lookup
- agent/software-canonical-lookup-request
- collector/nvd-index
- agent/softwarecombine
- agent/tags
- vendor/mozilla
- canonical/thunderbird
- canonical/firefox
- canonical/firefox esr