CVE-2021-23360Public exploitNetwork attack vector

Arbitrary command execution via unsanitized port

Published Mar 21, 2021 · Updated Sep 17, 2024

Command injection in ssnau killport before 1.0.2 allows attackers to execute arbitrary OS commands through a crafted port value. The exported function concatenates the supplied port into an lsof command string and passes it to child_process.exec without validation. Exploitation requires a consuming application to pass attacker-controlled data to the library; commands run with that application's privileges.

CVSS severity7.5
High
EPSS probability2.34%
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 ssnau killport before 1.0.2 allows attackers to execute arbitrary OS commands through a crafted port value. The exported function concatenates the supplied port into an lsof command string and passes it to child_process.exec without validation. Exploitation requires a consuming application to pass attacker-controlled data to the library; commands run with that application's privileges.

The record

CVE
CVE-2021-23360
Published
Mar 21, 2021
Updated
Sep 17, 2024
Vendor
ssnau
Product
killport
Classifications
CWE-77, T1059.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 21, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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 <1.0.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

ssnau · killportversion=unspecified <1.0.2

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.5NIST NVDAV:N/AC:L/Au:S/C:P/I:P/A:P
7.5SnykCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('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

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Your stack

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