CVE-2021-26691
high
CVSS v3
—
CVSS v4 NEW
—
VIR risk
8.0
Description
In Apache HTTP Server versions 2.4.0 to 2.4.46 a specially crafted SessionHeader sent by an origin server could cause a heap overflow
Predictions
Exploit likelihood
20%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
SUSE Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | — |
AlmaLinux Fixed 1 release
| Version | Status | Fixed in |
|---|---|---|
| 8 | Fixed | mod_md-2.0.8-8.module_el8.6.0+2872+fe0ff7aa.aarch64.rpm |
Arch Fixed 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Fixed | 2.4.47-1 |
Debian Fixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 2.4.46-6 |
| sid | Fixed | 2.4.46-6 |
| forky | Fixed | 2.4.46-6 |
| bullseye | Fixed | 2.4.46-6 |
| bookworm | Fixed | 2.4.46-6 |
Red Hat Fixed 1 release
| Version | Status | Fixed in |
|---|---|---|
| 8 | Fixed | — |
Rocky Linux Fixed 1 release
| Version | Status | Fixed in |
|---|---|---|
| 8 | Fixed | — |
References
- https://security-tracker.debian.org/tracker/CVE-2021-26691
- https://www.suse.com/security/cve/CVE-2021-26691.html
- https://errata.rockylinux.org/RLSA-2021:4537
- https://errata.rockylinux.org/RLSA-2021:3816
- https://errata.almalinux.org/8/ALSA-2021-3816.html
- https://access.redhat.com/errata/RHSA-2021:3816
- https://access.redhat.com/errata/RHSA-2021:4537
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.