Is CVE-2024-27354 in the CISA KEV catalog?

No. CVE-2024-27354 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2024-27354?

CVE-2024-27354 has a CVSS v3 base score of 7.5 (HIGH).

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

CVE-2024-27354 has an EPSS score of 0.60% (44th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2024-27354?

Upgrade php-phpseclib on debian 11 to 2.0.30-2+deb11u2 or later. Fixes are available for 5 affected products.

CVE & CISA-KEV Catalog

CVE-2024-27354

HIGH

7.5

CVSS v3

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.

CWE-400Resource Exhaustion

How to fix

Remediation Available

php-phpseclibDebian

Fixed in:2.0.30-2+deb11u2CVE-2024-27354

Fixed in:2.0.42-1+deb12u2CVE-2024-27354

Fixed in:2.0.47-1CVE-2024-27354

php-phpseclibUbuntu

Fixed in:2.0.1-1ubuntu0.1~esm2USN-7404-1

Fixed in:2.0.9-1ubuntu0.1~esm2USN-7404-1

Fixed in:2.0.23-2ubuntu0.1~esm2USN-7404-1

Fixed in:2.0.36-1ubuntu0.1~esm2USN-7404-1

php-phpseclib3Ubuntu

Fixed in:3.0.13-1ubuntu0.1~esm1USN-7404-1

php-seclibUbuntu

Fixed in:1.0.1-3ubuntu0.1+esm1USN-7404-1

Fixed in:1.0.9-1ubuntu0.1~esm1USN-7404-1

Fixed in:1.0.18-2ubuntu0.1~esm1USN-7404-1

Fixed in:1.0.20-1ubuntu0.1~esm1USN-7404-1

phpseclibUbuntu

Fixed in:1.0.1-3ubuntu0.1+esm1USN-7404-1

Fixed in:1.0.9-1ubuntu0.1~esm1USN-7404-1

Fixed in:1.0.18-2ubuntu0.1~esm1USN-7404-1

Fixed in:1.0.20-1ubuntu0.1~esm1USN-7404-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

0.60%probability of exploitation in 30 days

44thpercentile

Moderate risk: more likely to be exploited than 44% of all known CVEs.

References

Third-Party Advisory3

Product1

github.com

Related Vulnerabilities

Other CWE-400 (Resource Exhaustion) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-44487	High	7.5	100%	KEV	Fix
CVE-2021-44228	Critical	10.0	100%	KEV + Ransom	Fix
CVE-2011-3192	High	7.8	99%	-	Fix
CVE-2019-11478	Medium	5.3	95%	-	Fix
CVE-2024-25617	Medium	5.3	89%	-	Fix
CVE-2018-1000115	High	7.5	89%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-09-15.