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Vulnerability record · CVE-2024-27354 · published 1 March 2024

CVE-2024-27354: Phpseclib uncontrolled resource consumption vulnerability

Phpseclib · Phpseclib

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.

7.5 CVSS 3.1 High EPSS 0.60% · top 53.3% CWE-400 · Uncontrolled resource consumption
7.5CVSS 3.1 base score
0.60%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

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.

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://gist.github.com/katzj/ee72f3c2a00590812b2ea3c0c8890e0b Third Party Advisory
https://github.com/phpseclib/phpseclib/blob/master/phpseclib/Math/PrimeField.php#L49 Product
https://lists.debian.org/debian-lts-announce/2024/03/msg00002.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2024/03/msg00003.html Mailing ListThird Party Advisory
https://gist.github.com/katzj/ee72f3c2a00590812b2ea3c0c8890e0b Third Party Advisory
https://github.com/phpseclib/phpseclib/blob/master/phpseclib/Math/PrimeField.php#L49 Product
https://lists.debian.org/debian-lts-announce/2024/03/msg00002.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2024/03/msg00003.html Mailing ListThird Party Advisory

Track CVE-2024-27354 inside VULONE

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2024-27354), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.