CVE-2021-21412Public exploitNetwork attack vector

Arbitrary code execution via GPG command injection

Published Mar 30, 2021 · Updated Aug 3, 2024

Command injection in @thi.ng/egf before 0.4.0 allows remote authenticated users to run OS commands through crafted #gpg values. The gpg tag parser interpolates an encrypted value into an execSync shell command, allowing backticks to trigger command substitution before GPG receives the value. Exploitation requires a Node.js application to enable the nondefault decrypt option and pass attacker-controlled EGF content, after which commands run with that application’s privileges.

CVSS severity6.4
Medium
EPSS probability1.34%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Command injection in @thi.ng/egf before 0.4.0 allows remote authenticated users to run OS commands through crafted #gpg values. The gpg tag parser interpolates an encrypted value into an execSync shell command, allowing backticks to trigger command substitution before GPG receives the value. Exploitation requires a Node.js application to enable the nondefault decrypt option and pass attacker-controlled EGF content, after which commands run with that application’s privileges.

The record

CVE
CVE-2021-21412
Published
Mar 30, 2021
Updated
Aug 3, 2024
Vendor
thi.ng
Product
@thi.ng/egf
Classifications
CWE-78, T1059.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 30, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.4.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

thi.ng · @thi.ng/egfversion=< 0.4.0

Published CVSS scores

6.5NIST NVDAV:N/AC:L/Au:S/C:P/I:P/A:P
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.4GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 11, 2026Sep 17, 2026
Latest reporting daySep 17, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059.004Unix Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo