CVE-2024-27354

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.

Published: 2024-03-01 Last update: 2025-09-15 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2024-27354 is rated Moderate Risk (42.6/100): CVSS High severity, with low exploitation likelihood (EPSS 0.15%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2024-27354

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-01-26 0.12% 0.15% +0.03%
2 2025-11-21 0.69% 0.12% -0.56%
3 2025-11-18 — 0.69% —

Full EPSS history (10 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2024-27354

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2024-27354

GitHub Security Advisory for CVE-2024-27354

GHSA-2528-jw5q-ww88 · Severity: high · Ecosystem: composer — phpseclib: guardrails needed on isPrime and randomPrime

OS Trackers for CVE-2024-27354

vendor priority summary link
debian not yet assigned CVE-2024-27354 not yet assigned priority: Debian including 3 source packages (php-phpseclib, php-phpseclib3, phpseclib), 13 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 13. https://security-tracker.debian.org/tracker/CVE-2024-27354
ubuntu medium CVE-2024-27354 medium priority: Ubuntu including 3 source packages (php-phpseclib, php-phpseclib3, phpseclib), 33 status rows across 11 suites (bionic, focal, jammy, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): not-affected 12, released 12, DNE 5, ignored 4. https://ubuntu.com/security/CVE-2024-27354

Affected software / configurations for CVE-2024-27354

Vendor Product Version Raw CPE
phpseclib phpseclib >= 1.0.0, < 1.0.23 cpe:2.3:a:phpseclib:phpseclib:*:*:*:*:*:*:*:*
phpseclib phpseclib >= 2.0.0, < 2.0.47 cpe:2.3:a:phpseclib:phpseclib:*:*:*:*:*:*:*:*
phpseclib phpseclib >= 3.0.0, < 3.0.36 cpe:2.3:a:phpseclib:phpseclib:*:*:*:*:*:*:*:*
debian debian_linux 10.0 cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*

References for CVE-2024-27354

cvelogic Threat Intelligence