Strix
26.1K

CVE-2021-3311

CRITICALCVSS 9.8/10EPSS 2.90%

Last modified

CVE-2021-3311 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. An issue was discovered in October through build 471. It reactivates an old session ID (which had been invalid after a logout) once a new login occurs. EPSS estimates a 2.90% chance of exploitation in the next 30 days.

Description

An issue was discovered in October through build 471. It reactivates an old session ID (which had been invalid after a logout) once a new login occurs. NOTE: this violates the intended Auth/Manager.php authentication behavior but, admittedly, is only relevant if an old session ID is known to an attacker.

Metrics

CVSS 3.1
9.8/10

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

EPSS Probability
2.90%

85.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
OctobercmsOctober<= 1.0.471

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-3311?
An issue was discovered in October through build 471. It reactivates an old session ID (which had been invalid after a logout) once a new login occurs. NOTE: this violates the intended Auth/Manager.php authentication behavior but, admittedly, is only relevant if an old session ID is known to an attacker.
How severe is CVE-2021-3311?
CVE-2021-3311 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.90% probability of exploitation in the next 30 days.
How do I fix CVE-2021-3311?
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.

Are you affected by CVE-2021-3311?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST