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CVE-2021-44734

34
FAUCET Score

CVE-2021-44734 is a critical input sanitization vulnerability affecting Lexmark embedded web servers, allowing for remote code execution on vulnerable devices. With a CVSS score of 9.8, it presents a severe risk due to its network-based attack vector, low attack complexity, and high impact on confidentiality, integrity, and availability. While there is no evidence of active exploitation or public exploit code, the vulnerability has garnered significant community attention, indicating potential future exploitation.

Impacted Technologies

VendorProductVersion(s)CPE
< mslsg.076.294CPE matchmatch criteria
cpe:2.3:o:lexmark:b2236_firmware:*:*:*:*:*:*:*:*
< mxlsg.076.294CPE matchmatch criteria
cpe:2.3:o:lexmark:mb2236_firmware:*:*:*:*:*:*:*:*
< mslbd.076.294CPE matchmatch criteria
cpe:2.3:o:lexmark:ms431_firmware:*:*:*:*:*:*:*:*
< mslbd.076.294CPE matchmatch criteria
cpe:2.3:o:lexmark:ms331_firmware:*:*:*:*:*:*:*:*
< mslbd.076.294CPE matchmatch criteria
cpe:2.3:o:lexmark:m1342_firmware:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
6.43%
Probability of exploitation in next 30 days
EPSS Percentile
93.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0643 is in the 88th percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

support.lexmark.com / alerts
Vendor Advisory
zerodayinitiative.com / advisories/ZDI-22-332
Third Party AdvisoryVDB Entry