CVE-2021-39238Public exploitNetwork attack vector

Code execution via unchecked font array index

Published Nov 3, 2021 · Updated Aug 4, 2024

Buffer overflow in HP Enterprise LaserJet, LaserJet Managed, Enterprise PageWide, and PageWide Managed printers allows attackers to execute code. The firmware font parser uses an attacker-controlled array index without adequate validation, causing memory corruption when it processes a crafted print job. Unauthenticated network delivery requires access to JetDirect TCP port 9100; local exploitation requires enabled USB printing, and successful exploitation grants full control of the printer.

CVSS severity9.3
Critical
EPSS probability12.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in HP Enterprise LaserJet, LaserJet Managed, Enterprise PageWide, and PageWide Managed printers allows attackers to execute code. The firmware font parser uses an attacker-controlled array index without adequate validation, causing memory corruption when it processes a crafted print job. Unauthenticated network delivery requires access to JetDirect TCP port 9100; local exploitation requires enabled USB printing, and successful exploitation grants full control of the printer.

The record

CVE
CVE-2021-39238
Published
Nov 3, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-129, CWE-120, T1210
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 3, 2021CVE 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.3HP Inc.CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/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
7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-129Improper Validation of Array Index
CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1210Exploitation of Remote Services

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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