Vulnerability in phpseclib (CVE-2021-30130)

Summary

Vulnerability in phpseclib (CVE-2021-30130). Data can be tampered with by attackers.

Original description

The description as published by the source.

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

Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A weakness called CVE-2021-30130 was discovered in phpseclib.
Severity is Info. Low severity or not yet rated.
What you should do: update the affected software to the latest version. If unsure, ask your IT team or search the vendor's site for "phpseclib CVE-2021-30130".

CVE-2021-30130 (phpseclib). Severity: Info.
Response plan:

Check the vendor advisory for affected versions and the patched release.
If a vulnerable version is running in production, schedule maintenance (urgency from KEV/CVSS).
If no patch yet, mitigate via WAF rule, disabling the affected feature, etc.
Monitor logs / SIEM for known IOC and PoC signatures of this CVE.
PoCs and fix commits: see the 'References' section, MITRE, and NVD.

❓ What is the problem

A weakness (CVE-2021-30130) in phpseclib. A serious software flaw has been identified.

📍 Affected scope

Target versions of phpseclib (see vendor advisory). If running in production, identify exposure immediately.

🔥 Severity

Severity: Info. Low severity or not yet rated.

🔧 How to fix

Update to the patched release as listed in the vendor advisory.

🛡️ Workaround

If a patch is not yet available, consider disabling the affected feature, applying WAF rules, blocking via network ACLs, or isolating the vulnerable version.

🔍 Detection

Check version information, scan dependencies via SBOM, and monitor SIEM for IOC and PoC signatures related to this CVE.

Fix status by distribution

Fixed packages published by each distribution for this CVE

Debian DEBIAN-CVE-2021-30130 php-phpseclib Fixed in: 2.0.30-2

References

advisory github.com
advisory github.com
advisory lists.debian.org
advisory lists.debian.org
patch github.com