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 81%

Summary

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 0xdeviner

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

81% chance of being exploited in the next 30 days.

CVSS V3.1

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

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Collectors

NVD DatabaseMitre Database3 Proof of Concept(s)

Credit

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