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CVE-2021-24020

CRITICALCVSS 9.8/10EPSS 0.62%

Last modified

CVE-2021-24020 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. A missing cryptographic step in the implementation of the hash digest algorithm in FortiMail 6.4.0 through 6.4.4, and 6.2.0 through 6.2.7 may allow an unauthenticated attacker to tamper with signed URLs by appending further data which allows bypass of signature verification.. EPSS estimates a 0.62% chance of exploitation in the next 30 days.

Description

A missing cryptographic step in the implementation of the hash digest algorithm in FortiMail 6.4.0 through 6.4.4, and 6.2.0 through 6.2.7 may allow an unauthenticated attacker to tamper with signed URLs by appending further data which allows bypass of signature verification.

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
0.62%

44.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
FortinetFortimail>= 6.2.0, <= 6.2.7
FortinetFortimail>= 6.4.0, < 6.4.5

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-24020?
A missing cryptographic step in the implementation of the hash digest algorithm in FortiMail 6.4.0 through 6.4.4, and 6.2.0 through 6.2.7 may allow an unauthenticated attacker to tamper with signed URLs by appending further data which allows bypass of signature verification.
How severe is CVE-2021-24020?
CVE-2021-24020 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.62% probability of exploitation in the next 30 days.
How do I fix CVE-2021-24020?
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-2021-24020?

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

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Source: NVD / NIST