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CVE-2021-3661

HIGH
8.4
CVSS Score
Published: November 21, 2022 at 09:19 PM UTC
Updated: June 17, 2026 at 04:05 AM UTC
41 products affected across 1 vendorZ240 Tower FirmwareZ2 Mini G3 FirmwareZ238 Microtower Firmware

Using HP Workstation BIOS by HP Inc.?

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Severity
HIGH8.4
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

Description

A potential security vulnerability has been identified in certain HP Workstation BIOS (UEFI firmware) which may allow arbitrary code execution. HP is releasing firmware mitigations for the potential vulnerability.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Z1 All in One G3 Firmware· HP
95%
1.31
hp-z1-all-in-one-g3 (same device)
Z2 Mini G3 Firmware· HP
95%
1.83
hp-z2-mini-g3 (same device)
Z2 Mini G4 Firmware· HP
95%
1.08.01
hp-z2-mini-g4 (same device)
Z2 Mini G5 Firmware· HP
95%
1.03.00_rev_a
hp-z2-mini-g5 (same device)
Z2 Small Form Factor G4 Firmware· HP
95%
1.08.01
hp-z2-small-form-factor-g4 (same device)
Z2 Small Form Factor G5 Firmware· HP
95%
1.03.00_rev_a
hp-z2-small-form-factor-g5 (same device)
Z2 Small Form Factor G8 Firmware· HP
95%
1.03.00_rev_a
hp-z2-small-form-factor-g8 (same device)
Z2 Tower G4 Firmware· HP
95%
1.08.01
hp-z2-tower-g4 (same device)
Z2 Tower G5 Firmware· HP
95%
1.03.00_rev_a
hp-z2-tower-g5 (same device)
Z2 Tower G8 Firmware· HP
95%
1.03.00_rev_a
hp-z2-tower-g8 (same device)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisory
Source: [email protected]
https://support.hp.com/us-en/document/ish_5670997-5671021-16/hpsbhf03770

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.4HIGHCISA-ADP
Attack Vector
LOCAL
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
NVD-CWE-noinfoCWE-94

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