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Vulnerability record · CVE-2021-30130 · published 6 April 2021
CVE-2021-30130: Phpseclib improper verification of cryptographic signature vulnerability
Phpseclib · Phpseclib
phpseclib before 2.0.31 and 3.x before 3.0.7 mishandles RSA PKCS#1 v1.5 signature verification.
7.5 CVSS 3.1 High EPSS 1.1% · top 37.0% CWE-347 · Improper verification of cryptographic signature
7.5CVSS 3.1 base score, v2 5.0
1.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
10References
17 Jun 2026Last modified by NVD
Description
phpseclib before 2.0.31 and 3.x before 3.0.7 mishandles RSA PKCS#1 v1.5 signature verification.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Affected products
2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.
References
| Link | Tags |
|---|---|
| https://github.com/phpseclib/phpseclib/pull/1635 | PatchThird Party Advisory |
| https://github.com/phpseclib/phpseclib/releases/tag/2.0.31 | Release NotesThird Party Advisory |
| https://github.com/phpseclib/phpseclib/releases/tag/3.0.7 | Release NotesThird Party Advisory |
| https://lists.debian.org/debian-lts-announce/2022/11/msg00024.html | Mailing ListThird Party Advisory |
| https://lists.debian.org/debian-lts-announce/2022/11/msg00025.html | Mailing ListThird Party Advisory |
| https://github.com/phpseclib/phpseclib/pull/1635 | PatchThird Party Advisory |
| https://github.com/phpseclib/phpseclib/releases/tag/2.0.31 | Release NotesThird Party Advisory |
| https://github.com/phpseclib/phpseclib/releases/tag/3.0.7 | Release NotesThird Party Advisory |
| https://lists.debian.org/debian-lts-announce/2022/11/msg00024.html | Mailing ListThird Party Advisory |
| https://lists.debian.org/debian-lts-announce/2022/11/msg00025.html | Mailing ListThird Party Advisory |
Track CVE-2021-30130 inside VULONE
Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.
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Source: NIST National Vulnerability Database (record CVE-2021-30130), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.
