CVE-2024-27354

Publication date 1 March 2024

Last updated 26 August 2025

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

7.5 · High

Score breakdown

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.

Status

Package Ubuntu Release Status
php-phpseclib 25.10 questing
Not affected
25.04 plucky
Not affected
24.10 oracular
Not affected
24.04 LTS noble
Not affected
23.10 mantic Ignored end of life, was needs-triage
22.04 LTS jammy
Fixed 2.0.36-1ubuntu0.1~esm2
20.04 LTS focal
Fixed 2.0.23-2ubuntu0.1~esm2
18.04 LTS bionic
Fixed 2.0.9-1ubuntu0.1~esm2
16.04 LTS xenial
Fixed 2.0.1-1ubuntu0.1~esm2
14.04 LTS trusty Not in release
php-phpseclib3 25.10 questing
Not affected
25.04 plucky
Not affected
24.10 oracular
Not affected
24.04 LTS noble
Not affected
23.10 mantic Ignored end of life, was needs-triage
22.04 LTS jammy
Fixed 3.0.13-1ubuntu0.1~esm1
20.04 LTS focal Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
phpseclib 25.10 questing
Not affected
25.04 plucky
Not affected
24.10 oracular
Not affected
24.04 LTS noble
Not affected
23.10 mantic Ignored end of life, was needs-triage
22.04 LTS jammy
Fixed 1.0.20-1ubuntu0.1~esm1
20.04 LTS focal
Fixed 1.0.18-2ubuntu0.1~esm1
18.04 LTS bionic
Fixed 1.0.9-1ubuntu0.1~esm1
16.04 LTS xenial
Fixed 1.0.1-3ubuntu0.1+esm1
14.04 LTS trusty Ignored end of standard support

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Severity score breakdown

Parameter Value
Base score 7.5 · High
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

    • USN-7404-1
    • phpseclib vulnerabilities
    • 2 April 2025

Other references