CVE-2024-27354

high

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.

References

Advisories
More

https://lists.debian.org/debian-lts-announce/2024/03/msg00003.html

https://lists.debian.org/debian-lts-announce/2024/03/msg00002.html

https://gist.github.com/katzj/ee72f3c2a00590812b2ea3c0c8890e0b

https://github.com/phpseclib/phpseclib/blob/master/phpseclib/Math/PrimeField.php#L49

Details

Source: Mitre, NVD

Published: 2024-03-01

Updated: 2025-09-15

Risk Information

CVSS v2

Base Score: 7.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

Severity: High

CVSS v3

Base Score: 7.5

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

Severity: High

CVSS v4

Base Score: 8.7

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Severity: High

EPSS

EPSS: 0.003