CVE-2021-26690
HIGHCVSS 7.5/10EPSS 65.07%
Last modified
CVE-2021-26690 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Apache HTTP Server versions 2.4.0 to 2.4.46 A specially crafted Cookie header handled by mod_session can cause a NULL pointer dereference and crash, leading to a possible Denial Of Service. EPSS estimates a 65.07% chance of exploitation in the next 30 days.
Description
Apache HTTP Server versions 2.4.0 to 2.4.46 A specially crafted Cookie header handled by mod_session can cause a NULL pointer dereference and crash, leading to a possible Denial Of Service
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Apache | Http Server | >= 2.4.0, <= 2.4.46 |
| Debian | Debian Linux | 9.0 |
| Debian | Debian Linux | 10.0 |
| Fedoraproject | Fedora | 34 |
| Fedoraproject | Fedora | 35 |
| Oracle | Enterprise Manager Ops Center | 12.4.0.0 |
| Oracle | Instantis Enterprisetrack | 17.1 |
| Oracle | Instantis Enterprisetrack | 17.2 |
| Oracle | Instantis Enterprisetrack | 17.3 |
| Oracle | Zfs Storage Appliance Kit | 8.8 |
References
- http://httpd.apache.org/security/vulnerabilities_24.htmlRelease Notes, Vendor Advisory
- http://www.openwall.com/lists/oss-security/2021/06/10/6Mailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/07/msg00006.htmlMailing List, Third Party Advisory
- 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 List, Third Party Advisory
- https://www.oracle.com/security-alerts/cpuoct2021.htmlThird Party Advisory
- http://httpd.apache.org/security/vulnerabilities_24.htmlRelease Notes, Vendor Advisory
- http://www.openwall.com/lists/oss-security/2021/06/10/6Mailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/07/msg00006.htmlMailing List, Third Party Advisory
- 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 List, Third Party Advisory
- https://www.oracle.com/security-alerts/cpuoct2021.htmlThird Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-26690?
Apache HTTP Server versions 2.4.0 to 2.4.46 A specially crafted Cookie header handled by mod_session can cause a NULL pointer dereference and crash, leading to a possible Denial Of Service
How severe is CVE-2021-26690?
CVE-2021-26690 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 65.07% probability of exploitation in the next 30 days.
How do I fix CVE-2021-26690?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-26690?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST