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CVE-2021-30130

24
FAUCET Score

CVE-2021-30130 is a high-severity vulnerability affecting phpseclib versions before 2.0.31 and 3.x before 3.0.7, specifically impacting RSA PKCS#1 v1.5 signature verification. With a CVSS score of 7.5, it allows unauthenticated attackers to achieve high integrity impact over a network with low attack complexity. There is currently no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.0.31CPE matchmatch criteria
cpe:2.3:a:phpseclib:phpseclib:*:*:*:*:*:*:*:*
>= 3.0, < 3.0.7CPE matchmatch criteria
cpe:2.3:a:phpseclib:phpseclib:*:*:*:*:*:*:*:*
10.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.05%
Probability of exploitation in next 30 days
EPSS Percentile
60.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0106 is in the 38th percentile among its peer group of 51,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

composerpatch availablevia ghsa
Product: phpseclib/phpseclibFixed in: 3.0.7
composerpatch availablevia ghsa
Product: phpseclib/phpseclibFixed in: 2.0.31
github_advisorypatch availablevia nvd_reference
View patch

Vendor Advisories (1)

composerGHSA-vf4w-fg7r-5v94high

Improper Certificate Validation in phpseclib

Apr 7, 2021

References

github.com / phpseclib/phpseclib/pull/1635
PatchThird Party Advisory
github.com / phpseclib/phpseclib/releases/tag/2.0.31
Release NotesThird Party Advisory
github.com / phpseclib/phpseclib/releases/tag/3.0.7
Release NotesThird Party Advisory
lists.debian.org / debian-lts-announce/2022/11/msg00024.html
Mailing ListThird Party Advisory
lists.debian.org / debian-lts-announce/2022/11/msg00025.html
Mailing ListThird Party Advisory