Is CVE-2024-27354 actively exploited?

CVE-2024-27354 has no public evidence of in-the-wild exploitation as of 2025-09-15.

What is the CVSS score for CVE-2024-27354?

CVE-2024-27354 has a CVSS score of 7.5 (HIGH severity). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

How do I patch CVE-2024-27354?

Patch guidance is available from phpseclib security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2024-27354.

Fix CVE-2024-27354 - HIGH phpseclib phpseclib

Q: Which products are affected by CVE-2024-27354?

4 products: phpseclib phpseclib, phpseclib phpseclib, phpseclib phpseclib, debian debian linux.

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 Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector: network
Complexity: low
Privileges: none
User Action: none
Scope: unchanged
Confidentiality: none
Integrity: none
Availability: high
Weaknesses: CWE-400

Metadata

Primary Vendor: PHPSECLIB
Published: 3/1/2024
Last Modified: 9/15/2025
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

phpseclib : phpseclibphpseclib : phpseclibphpseclib : phpseclibdebian : debian_linux

Remediation Guidance

Executive Summary

Cite this page

CVE-2024-27354. CVEDatabase.com. Retrieved 1 May 2026. https://cvedatabase.com/cve/CVE-2024-27354

View on NIST NVD

CVE-2024-27354 vulnerability