mod_session NULL pointer dereference
CVE-2021-26690

7.5HIGH

Key Information:

Vendor

Apache
Status
Apache Http Server
Vendor
CVE Published:
10 June 2021

Badges

👾 Exploit Exists🟡 Public PoC🟣 EPSS 59%

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

Affected Version(s)

Apache HTTP Server 2.4.46

Apache HTTP Server 2.4.43

Apache HTTP Server 2.4.41

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2021-26690---Apache-mod_session
Created by 7own

CVE-2021-26690
Created by dja2TaqkGEEfA45

References

http://httpd.apache.org/security/vulnerabilities_24.html
x_refsource_MISC
https://lists.apache.org/thread.html/re026d3da9d7824bd93b...
x_refsource_MISC
https://lists.apache.org/thread.html/rae406c1d19c0dfd3103...
mailing-listx_refsource_MLIST

EPSS Score

59% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 👾

    Exploit known to exist

  • 🟡

    Public PoC available

  • Vulnerability published

  • Vulnerability Reserved

Credit

This issue was discovered and reported by GHSL team member @antonio-morales (Antonio Morales)
.