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Vulnerability details: VCID-u92f-5dkr-kfbx
Vulnerability ID VCID-u92f-5dkr-kfbx
Aliases CVE-2021-30130
GHSA-vf4w-fg7r-5v94
Summary Improper Certificate Validation in phpseclib phpseclib before 2.0.31 and 3.x before 3.0.7 mishandles RSA PKCS#1 v1.5 signature verification.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (4)
CWE-295 Improper Certificate Validation
CWE-347 Improper Verification of Cryptographic Signature
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 0.00155 https://api.first.org/data/v1/epss?cve=CVE-2021-30130
epss 0.00155 https://api.first.org/data/v1/epss?cve=CVE-2021-30130
epss 0.00155 https://api.first.org/data/v1/epss?cve=CVE-2021-30130
epss 0.00155 https://api.first.org/data/v1/epss?cve=CVE-2021-30130
epss 0.00155 https://api.first.org/data/v1/epss?cve=CVE-2021-30130
epss 0.00155 https://api.first.org/data/v1/epss?cve=CVE-2021-30130
epss 0.00155 https://api.first.org/data/v1/epss?cve=CVE-2021-30130
epss 0.00155 https://api.first.org/data/v1/epss?cve=CVE-2021-30130
epss 0.00155 https://api.first.org/data/v1/epss?cve=CVE-2021-30130
epss 0.00155 https://api.first.org/data/v1/epss?cve=CVE-2021-30130
epss 0.00155 https://api.first.org/data/v1/epss?cve=CVE-2021-30130
epss 0.00155 https://api.first.org/data/v1/epss?cve=CVE-2021-30130
epss 0.00155 https://api.first.org/data/v1/epss?cve=CVE-2021-30130
epss 0.00155 https://api.first.org/data/v1/epss?cve=CVE-2021-30130
epss 0.00155 https://api.first.org/data/v1/epss?cve=CVE-2021-30130
epss 0.00155 https://api.first.org/data/v1/epss?cve=CVE-2021-30130
epss 0.00155 https://api.first.org/data/v1/epss?cve=CVE-2021-30130
epss 0.00155 https://api.first.org/data/v1/epss?cve=CVE-2021-30130
epss 0.00155 https://api.first.org/data/v1/epss?cve=CVE-2021-30130
cvssv3.1_qr HIGH https://github.com/advisories/GHSA-vf4w-fg7r-5v94
cvssv3.1 7.5 https://github.com/FriendsOfPHP/security-advisories/blob/master/phpseclib/phpseclib/CVE-2021-30130.yaml
generic_textual HIGH https://github.com/FriendsOfPHP/security-advisories/blob/master/phpseclib/phpseclib/CVE-2021-30130.yaml
cvssv3.1 7.5 https://github.com/phpseclib/phpseclib/pull/1635
generic_textual HIGH https://github.com/phpseclib/phpseclib/pull/1635
cvssv3.1 7.5 https://github.com/phpseclib/phpseclib/releases/tag/2.0.31
generic_textual HIGH https://github.com/phpseclib/phpseclib/releases/tag/2.0.31
cvssv3.1 7.5 https://github.com/phpseclib/phpseclib/releases/tag/3.0.7
generic_textual HIGH https://github.com/phpseclib/phpseclib/releases/tag/3.0.7
cvssv3.1 7.5 https://lists.debian.org/debian-lts-announce/2022/11/msg00024.html
generic_textual HIGH https://lists.debian.org/debian-lts-announce/2022/11/msg00024.html
cvssv3.1 7.5 https://lists.debian.org/debian-lts-announce/2022/11/msg00025.html
generic_textual HIGH https://lists.debian.org/debian-lts-announce/2022/11/msg00025.html
cvssv2 5.0 https://nvd.nist.gov/vuln/detail/CVE-2021-30130
cvssv3.1 7.5 https://nvd.nist.gov/vuln/detail/CVE-2021-30130
generic_textual HIGH https://nvd.nist.gov/vuln/detail/CVE-2021-30130
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2021-30130
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-30130
https://github.com/FriendsOfPHP/security-advisories/blob/master/phpseclib/phpseclib/CVE-2021-30130.yaml
https://github.com/phpseclib/phpseclib/pull/1635
https://github.com/phpseclib/phpseclib/releases/tag/2.0.31
https://github.com/phpseclib/phpseclib/releases/tag/3.0.7
https://lists.debian.org/debian-lts-announce/2022/11/msg00024.html
https://lists.debian.org/debian-lts-announce/2022/11/msg00025.html
https://nvd.nist.gov/vuln/detail/CVE-2021-30130
cpe:2.3:a:phpseclib:phpseclib:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:phpseclib:phpseclib:*:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
GHSA-vf4w-fg7r-5v94 https://github.com/advisories/GHSA-vf4w-fg7r-5v94
USN-7404-1 https://usn.ubuntu.com/7404-1/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N Found at https://github.com/FriendsOfPHP/security-advisories/blob/master/phpseclib/phpseclib/CVE-2021-30130.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N Found at https://github.com/phpseclib/phpseclib/pull/1635
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N Found at https://github.com/phpseclib/phpseclib/releases/tag/2.0.31
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N Found at https://github.com/phpseclib/phpseclib/releases/tag/3.0.7
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N Found at https://lists.debian.org/debian-lts-announce/2022/11/msg00024.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N Found at https://lists.debian.org/debian-lts-announce/2022/11/msg00025.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:N/AC:L/Au:N/C:N/I:P/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-30130
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2021-30130
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.37058
EPSS Score 0.00155
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:49:01.598412+00:00 GithubOSV Importer Import https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/04/GHSA-vf4w-fg7r-5v94/GHSA-vf4w-fg7r-5v94.json 37.0.0