CVE-2022-21187Public exploitNetwork attack vector

Arbitrary command execution via Mercurial URL alias

Published Mar 14, 2022 · Updated Sep 16, 2024

Command injection in Tony Narlock libvcs before 0.11.1 allows attackers to execute arbitrary shell commands through a Mercurial URL. The Mercurial repository obtain path passes the URL to hg clone before an end-of-options marker, so a leading --config option defines a clone alias that runs a shell command. Exploitation requires an application to pass attacker-controlled repository URLs to Mercurial-backed obtain() or update_repo() operations.

CVSS severity8.1
High
EPSS probability3.62%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in Tony Narlock libvcs before 0.11.1 allows attackers to execute arbitrary shell commands through a Mercurial URL. The Mercurial repository obtain path passes the URL to hg clone before an end-of-options marker, so a leading --config option defines a clone alias that runs a shell command. Exploitation requires an application to pass attacker-controlled repository URLs to Mercurial-backed obtain() or update_repo() operations.

The record

CVE
CVE-2022-21187
Published
Mar 14, 2022
Updated
Sep 16, 2024
Vendor
Tony Narlock
Product
libvcs
Classifications
CWE-88, T1202
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 14, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=unspecified <0.11.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Tony Narlock · libvcsversion=unspecified <0.11.1

Published CVSS scores

7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
8.1SnykCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.3GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA: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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-88Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')
T1202Indirect Command Execution

Public exploit references

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

Technologies

Your stack

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Your stack

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