CVE-2021-43535
high
CVSS v3
—
CVSS v2
—
VIR risk
8.0
Description
A use-after-free could have occured when an HTTP2 session object was released on a different thread, leading to memory corruption and a potentially exploitable crash. This vulnerability affects Firefox < 93, Thunderbird < 91.3, and Firefox ESR < 91.3.
Predictions
Exploit likelihood
20%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: rocky — https://errata.rockylinux.org/RLSA-2021:4123
Vendor advisory: rocky — https://errata.rockylinux.org/RLSA-2021:4130
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2021-43535
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| debian | sid | fixed | 93.0-1 |
| debian | bookworm | fixed | 91.3.0esr-1 |
| debian | bullseye | fixed | 91.4.1esr-1~deb11u1 |
| debian | forky | fixed | 91.3.0esr-1 |
| debian | trixie | fixed | 91.3.0esr-1 |
| rocky | 8 | fixed | |
References
Verify integrity in audit chain (admin only). AS-IS.