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Fencer Intel
critical 9.8

CVE-2021-3942 json

Certain HP Print products and Digital Sending products may be vulnerable to potential remote code execution and buffer overflow with use of…

published 3y ago modified 4mo ago also EUVD-2021-27155

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.6%
EPSS 1.6% chance of exploitation in 30 days, percentile 75%
public exploits
0
none known

Summary

Certain HP Print products and Digital Sending products may be vulnerable to potential remote code execution and buffer overflow with use of Link-Local Multicast Name Resolution or LLMNR.

Patch / fix

  • hp color_laserjet_cm4540_mfp_cc419a_firmware 3.9.9
  • hp color_laserjet_cm4540_mfp_cc420a_firmware 3.9.9
  • hp color_laserjet_cm4540_mfp_cc421a_firmware 3.9.9
  • hp color_laserjet_cm5525_mfp_ce707a_firmware 3.9.9
  • hp color_laserjet_cm5525_mfp_ce708a_firmware 3.9.9
  • hp color_laserjet_cm5525_mfp_ce709a_firmware 3.9.9
  • hp color_laserjet_m578_mfp_7zu85a_firmware 4.11.2.3, 5.4
  • hp color_laserjet_m578_mfp_7zu86a_firmware 4.11.2.3, 5.4
  • hp color_laserjet_m578_mfp_7zu87a_firmware 4.11.2.3, 5.4
  • hp color_laserjet_m578_mfp_7zu88a_firmware 4.11.2.3, 5.4
  • hp color_laserjet_enterprise_flow_mfp_m880z_d7p70a_firmware 3.9.9, 4.11.2.3
  • hp color_laserjet_enterprise_flow_mfp_m880z_a2w75a_firmware 3.9.9, 4.11.2.3
  • hp color_laserjet_enterprise_flow_mfp_m880z_a2w76a_firmware 3.9.9, 4.11.2.3
  • hp color_laserjet_enterprise_flow_mfp_m880z_d7p71a_firmware 3.9.9, 4.11.2.3
  • hp color_laserjet_enterprise_flow_mfp_m880z_l3u51a_firmware 3.9.9, 4.11.2.3
  • hp color_laserjet_enterprise_flow_mfp_m880z_l3u52a_firmware 3.9.9, 4.11.2.3
  • hp color_laserjet_managed_flow_mfp_m880zm_d7p70a_firmware 3.9.9, 4.11.2.3
  • hp color_laserjet_managed_flow_mfp_m880zm_a2w75a_firmware 3.9.9, 4.11.2.3
  • hp color_laserjet_managed_flow_mfp_m880zm_a2w76a_firmware 3.9.9, 4.11.2.3
  • hp color_laserjet_managed_flow_mfp_m880zm_d7p71a_firmware 3.9.9, 4.11.2.3

Is CVE-2021-3942 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
last yr.

Exploit prediction

1.56% chance of exploitation in the next 30 days, higher than 75% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CISA ADP 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

  • HP Inc. HP Print products and Digital Sending products

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.