CVE-2021-30130

Name: CVE-2021-30130
Creator: NVD / NIST
Published: 2021-04-06T15:15:13.497+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.08%

Last modified Jun 17, 2026

CVE-2021-30130 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. phpseclib before 2.0.31 and 3.x before 3.0.7 mishandles RSA PKCS#1 v1.5 signature verification.. EPSS estimates a 1.08% chance of exploitation in the next 30 days.

Description

phpseclib before 2.0.31 and 3.x before 3.0.7 mishandles RSA PKCS#1 v1.5 signature verification.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

1.08%

61.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-347

Affected Software

Vendor	Product	Versions
Phpseclib	Phpseclib	< 2.0.31
Phpseclib	Phpseclib	>= 3.0, < 3.0.7
Debian	Debian Linux	10.0

References

https://github.com/phpseclib/phpseclib/pull/1635Patch, Third Party Advisory
https://github.com/phpseclib/phpseclib/releases/tag/2.0.31Release Notes, Third Party Advisory
https://github.com/phpseclib/phpseclib/releases/tag/3.0.7Release Notes, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/11/msg00024.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/11/msg00025.htmlMailing List, Third Party Advisory
https://github.com/phpseclib/phpseclib/pull/1635Patch, Third Party Advisory
https://github.com/phpseclib/phpseclib/releases/tag/2.0.31Release Notes, Third Party Advisory
https://github.com/phpseclib/phpseclib/releases/tag/3.0.7Release Notes, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/11/msg00024.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/11/msg00025.htmlMailing List, Third Party Advisory

Timeline

Published: Apr 6, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-30130?

phpseclib before 2.0.31 and 3.x before 3.0.7 mishandles RSA PKCS#1 v1.5 signature verification.

How severe is CVE-2021-30130?

CVE-2021-30130 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.08% probability of exploitation in the next 30 days.

How do I fix CVE-2021-30130?

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-2021-30130?

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

Scan your code now

Source: NVD / NIST