CVE-2024-27354

Name: CVE-2024-27354
Creator: NVD / NIST
Published: 2024-03-01T23:15:08.5+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.60%

Last modified Jun 17, 2026

CVE-2024-27354 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. An issue was discovered in phpseclib 1.x before 1.0.23, 2.x before 2.0.47, and 3.x before 3.0.36. An attacker can construct a malformed certificate containing an extremely large prime to cause a denial of service (CPU consumption for an isPrime primality check). EPSS estimates a 0.60% chance of exploitation in the next 30 days.

Description

An issue was discovered in phpseclib 1.x before 1.0.23, 2.x before 2.0.47, and 3.x before 3.0.36. An attacker can construct a malformed certificate containing an extremely large prime to cause a denial of service (CPU consumption for an isPrime primality check). NOTE: this issue was introduced when attempting to fix CVE-2023-27560.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

0.60%

44.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-400

Affected Software

Vendor	Product	Versions
Phpseclib	Phpseclib	>= 1.0.0, < 1.0.23
Phpseclib	Phpseclib	>= 2.0.0, < 2.0.47
Phpseclib	Phpseclib	>= 3.0.0, < 3.0.36
Debian	Debian Linux	10.0

References

https://gist.github.com/katzj/ee72f3c2a00590812b2ea3c0c8890e0bThird Party Advisory
https://github.com/phpseclib/phpseclib/blob/master/phpseclib/Math/PrimeField.php#L49Product
https://lists.debian.org/debian-lts-announce/2024/03/msg00002.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2024/03/msg00003.htmlMailing List, Third Party Advisory
https://gist.github.com/katzj/ee72f3c2a00590812b2ea3c0c8890e0bThird Party Advisory
https://github.com/phpseclib/phpseclib/blob/master/phpseclib/Math/PrimeField.php#L49Product
https://lists.debian.org/debian-lts-announce/2024/03/msg00002.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2024/03/msg00003.htmlMailing List, Third Party Advisory

Timeline

Published: Mar 1, 2024
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2024-27354?

How severe is CVE-2024-27354?

CVE-2024-27354 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.60% probability of exploitation in the next 30 days.

How do I fix CVE-2024-27354?

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-2024-27354?

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

Scan your code now

Source: NVD / NIST