CVE-2021-26690

mod_session NULL pointer dereference

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

Affected

Apache Software Foundation · Apache HTTP Server

CVSS v3.1 NVD

7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v2.0 NVD

5.0 MEDIUMAV:N/AC:L/Au:N/C:N/I:N/A:P

EPSS

65.31% chance of exploitation in the next 30 days, 99th percentile

Published

2021-06-10

Updated

2024-08-03

Proof-of-concept exploits (3)

• 7own/CVE-2021-26690---Apache-mod_session1★ · 2024-11-01
• danielduan2002/CVE-2021-266900★ · 2024-12-28
• fkm75P8YjLkb/CVE-2021-266900★ · 2021-07-15

Security advisories

• http://httpd.apache.org/security/vulnerabilities_24.html
• https://lists.apache.org/thread.html/re026d3da9d7824bd93b9f871c0fdda978d960c7e62d8c43cba8…
• http://www.openwall.com/lists/oss-security/2021/06/10/6
• https://lists.debian.org/debian-lts-announce/2021/07/msg00006.html
• https://security.gentoo.org/glsa/202107-38
• https://security.netapp.com/advisory/ntap-20210702-0001
• https://www.debian.org/security/2021/dsa-4937
• https://www.oracle.com/security-alerts/cpuoct2021.html

References

• CVE Record
• NVD entry

Related

• CVE-2021-26691
• CVE-2021-30641
• CVE-2021-34496