CVE-2020-26950 is a high-severity use-after-free vulnerability affecting Mozilla Firefox, Firefox ESR, and Thunderbird, stemming from unmet assumptions in the MCallGetProperty opcode. This flaw carries a CVSS score of 8.8, indicating it can be exploited remotely with low complexity, potentially leading to full compromise of confidentiality, integrity, and availability. While not listed on CISA's KEV, a Metasploit module exists for this vulnerability, and it has garnered significant community discussion and media coverage, including reports of its exploitation in a Chinese hacking contest.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 82.0.3CPE matchmatch criteria | cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* | ||
< 78.4.1CPE matchmatch criteria | cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:* | ||
< 78.4.2CPE matchmatch criteria | cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.1 Security Researcher mentions.