CVE-2024-27355

Name: CVE-2024-27355
Creator: NVD / NIST
Published: 2024-03-01T23:15:08.553+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.56%

Last modified Jun 17, 2026

CVE-2024-27355 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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).. EPSS estimates a 0.56% chance of exploitation in the next 30 days.

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).

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

0.56%

42.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-400

Affected Software

Vendor	Product	Versions
Phpseclib	Phpseclib	>= 1.0.0, < 1.0.23
Phpseclib	Phpseclib	>= 2.0.0, < 2.0.47
Phpseclib	Phpseclib	>= 3.0.0, < 3.0.36
Debian	Debian Linux	10.0

References

https://gist.github.com/katzj/ee72f3c2a00590812b2ea3c0c8890e0bThird Party Advisory
https://github.com/phpseclib/phpseclib/blob/978d081fe50ff92879c50ff143c62a143edb0117/phpseclib/File/ASN1.php#L1129Product
https://lists.debian.org/debian-lts-announce/2024/03/msg00002.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2024/03/msg00003.htmlMailing List, Third Party Advisory
https://gist.github.com/katzj/ee72f3c2a00590812b2ea3c0c8890e0bThird Party Advisory
https://github.com/phpseclib/phpseclib/blob/978d081fe50ff92879c50ff143c62a143edb0117/phpseclib/File/ASN1.php#L1129Product
https://lists.debian.org/debian-lts-announce/2024/03/msg00002.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2024/03/msg00003.htmlMailing List, Third Party Advisory

Timeline

Published: Mar 1, 2024
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2024-27355?

How severe is CVE-2024-27355?

CVE-2024-27355 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.56% probability of exploitation in the next 30 days.

How do I fix CVE-2024-27355?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2024-27355?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST