Vulnerability 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
CVSS Score
9.8
CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Apache | Http Server | >= 2.4.0, <= 2.4.46 |
| Debian | Debian Linux | 9.0 |
| Fedoraproject | Fedora | 34 |
| Oracle | Enterprise Manager Ops Center | 12.4.0.0 |
| Oracle | Instantis Enterprisetrack | 17.1 |
| Oracle | Secure Backup | < 18.1.0.1.0 |
| Oracle | Zfs Storage Appliance Kit | 8.8 |
| Netapp | Cloud Backup | - |
Related Weaknesses (CWE)
References
- http://httpd.apache.org/security/vulnerabilities_24.htmlVendor Advisory
- http://www.openwall.com/lists/oss-security/2021/06/10/7Mailing ListThird Party Advisory
- https://lists.apache.org/thread.html/r50cae1b71f1e7421069036b213c26da7d8f47dd598
- https://lists.apache.org/thread.html/r7f2b70b621651548f4b6f027552f1dd91705d7111b
- https://lists.apache.org/thread.html/re026d3da9d7824bd93b9f871c0fdda978d960c7e62Mailing ListRelease NotesVendor Advisory
- https://lists.debian.org/debian-lts-announce/2021/07/msg00006.htmlMailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://security.gentoo.org/glsa/202107-38Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210702-0001/Third Party Advisory
- https://www.debian.org/security/2021/dsa-4937Mailing ListThird Party Advisory
- https://www.oracle.com/security-alerts/cpujan2022.htmlPatchThird Party Advisory
- https://www.oracle.com/security-alerts/cpuoct2021.htmlPatchThird Party Advisory
- http://httpd.apache.org/security/vulnerabilities_24.htmlVendor Advisory
- http://www.openwall.com/lists/oss-security/2021/06/10/7Mailing ListThird Party Advisory
FAQ
What is CVE-2021-26691?
CVE-2021-26691 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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 severe is CVE-2021-26691?
CVE-2021-26691 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2021-26691?
Check the references section above for vendor advisories and patch information. Affected products include: Apache Http Server, Debian Debian Linux, Fedoraproject Fedora, Oracle Enterprise Manager Ops Center, Oracle Instantis Enterprisetrack.