What is CVE-2021-3438?

CVE-2021-3438 is a high-severity vulnerability in HP Color Laser 150 4zb94a, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.8/10. Published 2021-05-20.

How severe is CVE-2021-3438?

High severity. CVSS v3 base score is 7.8 out of 10.

Is CVE-2021-3438 known to be exploited?

13 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in HP Color Laser 150 4zb94a

CVE-2021-3438

A potential buffer overflow in the software drivers for certain HP LaserJet products and Samsung product printers could lead to an escalation of privilege.

Vulnerability class: Buffer Overflow

Published 2021-05-20 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.029 (86.6th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 87th percentile — 86.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.029 · newest: 0.029 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

Public proof-of-concept exploits

References

support.hp.com/us-en/document/ish_3900395-3833905-16 (Vendor Advisory)

Frequently asked questions

What is CVE-2021-3438?: CVE-2021-3438 is a high-severity vulnerability in HP Color Laser 150 4zb94a, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.8/10. Published 2021-05-20.
How severe is CVE-2021-3438?: High severity. CVSS v3 base score is 7.8 out of 10.
Is CVE-2021-3438 known to be exploited?: 13 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.