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CVE-2021-42761

CRITICALCVSS 9.8/10EPSS 1.47%

Last modified

CVE-2021-42761 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. A condition for session fixation vulnerability [CWE-384] in the session management of FortiWeb versions 6.4 all versions, 6.3.0 through 6.3.16, 6.2.0 through 6.2.6, 6.1.0 through 6.1.2, 6.0.0 through 6.0.7, 5.9.0 through 5.9.1 may allow a remote, unauthenticated attacker to infer the session identifier of other users and possibly usurp their session.. EPSS estimates a 1.47% chance of exploitation in the next 30 days.

Description

A condition for session fixation vulnerability [CWE-384] in the session management of FortiWeb versions 6.4 all versions, 6.3.0 through 6.3.16, 6.2.0 through 6.2.6, 6.1.0 through 6.1.2, 6.0.0 through 6.0.7, 5.9.0 through 5.9.1 may allow a remote, unauthenticated attacker to infer the session identifier of other users and possibly usurp their session.

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
1.47%

70.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
FortinetFortiweb>= 5.6.0, < 5.9.2
FortinetFortiweb>= 6.0.0, < 6.0.8
FortinetFortiweb>= 6.1.0, < 6.1.3
FortinetFortiweb>= 6.2.0, < 6.2.7
FortinetFortiweb>= 6.3.0, < 6.3.17
FortinetFortiweb>= 6.4.0, < 7.0.0

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-42761?
A condition for session fixation vulnerability [CWE-384] in the session management of FortiWeb versions 6.4 all versions, 6.3.0 through 6.3.16, 6.2.0 through 6.2.6, 6.1.0 through 6.1.2, 6.0.0 through 6.0.7, 5.9.0 through 5.9.1 may allow a remote, unauthenticated attacker to infer the session identifier of other users and possibly usurp their session.
How severe is CVE-2021-42761?
CVE-2021-42761 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.47% probability of exploitation in the next 30 days.
How do I fix CVE-2021-42761?
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-2021-42761?

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

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Source: NVD / NIST