Is CVE-2024-27355 in the CISA KEV catalog?

No. CVE-2024-27355 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2024-27355?

CVE-2024-27355 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2024-27355?

CVE-2024-27355 has an EPSS score of 0.57% (43th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2024-27355?

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-2024-27355

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. When processing the ASN.1 object identifier of a certificate, a sub identifier may be provided that leads to a denial of service (CPU consumption for decodeOID).

CWE-400Resource Exhaustion

How to fix

Remediation Available

php-phpseclibDebian

Fixed in:2.0.30-2+deb11u2CVE-2024-27355

Fixed in:2.0.42-1+deb12u2CVE-2024-27355

Fixed in:2.0.47-1CVE-2024-27355

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

0.57%probability of exploitation in 30 days

43rdpercentile

Moderate risk: more likely to be exploited than 43% 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.