How severe is CVE-2021-44735?

CVE-2021-44735 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-44735 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 8% (94th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-44735?

CVE-2021-44735 primarily affects Lexmark B2236 Firmware. In total, 118 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-44735?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-44735 published?

CVE-2021-44735 was published on 2022-01-20 and last updated on 2026-06-17.

CVE-2021-44735

CVE-2021-44735 is a critical-severity vulnerability in Lexmark B2236 Firmware with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-77.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 10.0
EPSS exploit prediction: 8% (94th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-77
Affected product: Lexmark B2236 Firmware
Published: 2022-01-20
Last modified: 2026-06-17

Description

Embedded web server command injection vulnerability in Lexmark devices through 2021-12-07.

Frequently asked questions

What is CVE-2021-44735?: Embedded web server command injection vulnerability in Lexmark devices through 2021-12-07.
How severe is CVE-2021-44735?: CVE-2021-44735 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-44735 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 8% (94th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-44735?: CVE-2021-44735 primarily affects Lexmark B2236 Firmware. In total, 118 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-44735?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-44735 published?: CVE-2021-44735 was published on 2022-01-20 and last updated on 2026-06-17.

References

Affected products (118)

cpe:2.3:o:lexmark:b2236_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:mb2236_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:ms431_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:ms331_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:m1342_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:b3442_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:b3340_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:xm1342_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:mx331_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:mx431_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:mb3442_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:ms321_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:ms421_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:ms521_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:ms621_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:m1242_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:m1246_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:b2338_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:b2442_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:b2546_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:b2650_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:ms622_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:m3250_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:mx321_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:mb2338_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:mx421_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:mx521_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:mx522_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:mx622_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:xm1242_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:xm1246_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:xm3250_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:mb2442_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:mb2546_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:mb2650_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:ms821_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:ms823_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:ms825_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:b2865_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:lexmark:ms725_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Lexmark B2236 Firmware

CVE-2023-23560 — Critical (CVSS 9.8): In certain Lexmark products through 2023-01-12, SSRF can occur because of a lack of input validation.
CVE-2021-44734 — Critical (CVSS 9.8): Embedded web server input sanitization vulnerability in Lexmark devices through 2021-12-07, which can which can lead to…
CVE-2021-44738 — Critical (CVSS 9.8): Buffer overflow vulnerability has been identified in Lexmark devices through 2021-12-07 in postscript interpreter.
CVE-2021-44737 — High (CVSS 8.8): PJL directory traversal vulnerability in Lexmark devices through 2021-12-07 that can be leveraged to overwrite internal…
CVE-2022-29850 — High (CVSS 8.1): Various Lexmark products through 2022-04-27 allow an attacker who has already compromised an affected Lexmark device to…
CVE-2023-22960 — High (CVSS 7.5): Lexmark products through 2023-01-10 have Improper Control of Interaction Frequency.

All CVEs affecting Lexmark B2236 Firmware →

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