CVE-2021-26691
Apache HTTP Server mod_session response handling heap overflow
9.8
CRITICAL
CVSS 3.1
EPSS 47.8%
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
How to fix CVE-2021-26691
To remediate CVE-2021-26691, upgrade the affected package to a fixed version below.
- Alpine/apache2—upgrade to 2.4.48-r0 or later
- Bitnami/apache—upgrade to 2.4.47 or later
- —upgrade to 2.4.46-6 or later
Is CVE-2021-26691 being exploited?
Moderate — EPSS is 47.8%. Track this CVE but it's not at the top of the prioritisation list.
Affected packages (3)
- from 0, < 2.4.48-r0
- >= 2.4.0, < 2.4.47
- from 0, < 2.4.46-6
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |