CVE-2021-44735Known exploitationPublic exploit

Authenticated code execution via packet-capture filter injection

Published Jan 20, 2022 · Updated Aug 4, 2024

Command injection in Lexmark printer firmware allows remote authenticated users to execute code through the embedded web server. The /usr/share/web/cgi-bin/sniffcapture_post script embeds a packet-capture filter from a POST body in an argument string passed to eval without validating shell metacharacters. Access requires authentication and local-network reachability; successful injection runs commands as the embedded web server's httpd account.

CVSS severity9.0
Critical
EPSS probability7.03%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in Lexmark printer firmware allows remote authenticated users to execute code through the embedded web server. The /usr/share/web/cgi-bin/sniffcapture_post script embeds a packet-capture filter from a POST body in an argument string passed to eval without validating shell metacharacters. Access requires authentication and local-network reachability; successful injection runs commands as the embedded web server's httpd account.

The record

CVE
CVE-2021-44735
Published
Jan 20, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-77, T1059.004
Attack vector
adjacent
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 20, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.0LexmarkCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:L
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
10.0NIST NVDAV:N/AC:L/Au:N/C:C/I:C/A:C

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)
Vectoradjacent
Privilegesauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1059.004Command and Scripting Interpreter: Unix Shell

Public exploit references

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

Reported exploitation

Technologies

Your stack

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Your stack

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