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CVE-2024-0840

Grandstream UCM Series IP PBX HTTP Parameter Injection

HIGH
8.8
CVSS Score
Published: April 29, 2024 at 06:42 PM UTC
Updated: June 17, 2026 at 06:54 AM UTC
9 products affected across 1 vendorUCM6204UCM6204 FirmwareUCM6202

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Severity
HIGH8.8
Exploit prediction
EPSS 0.9%
SSVC
No known exploit

Description

The Grandstream UCM Series IP PBX before firmware version 1.0.20.52 is affected by a parameter injection vulnerability in the HTTP interface. A remote and authenticated attacker can execute arbitrary code by sending a crafted HTTP request. Authentication may be possible using a default user and password. Affected models are the UCM6202, UCM6204, UCM6208, and UCM6510.

Affected

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

Ucm· Grandstream
60%
v < <1.0.20.52
Affected range stops below <1.0.20.52, so it looks safe — our inference, not a vendor statement
UCM6202· Grandstream
60%
v < 1.0.20.52
Affected range stops below 1.0.20.52, so it looks safe — our inference, not a vendor statement
UCM6202 Firmware· Grandstream
60%
v < 1.0.20.52
Affected range stops below 1.0.20.52, so it looks safe — our inference, not a vendor statement
UCM6204· Grandstream
60%
v < 1.0.20.52
Affected range stops below 1.0.20.52, so it looks safe — our inference, not a vendor statement
UCM6204 Firmware· Grandstream
60%
v < 1.0.20.52
Affected range stops below 1.0.20.52, so it looks safe — our inference, not a vendor statement
UCM6208· Grandstream
60%
v < 1.0.20.52
Affected range stops below 1.0.20.52, so it looks safe — our inference, not a vendor statement
UCM6208 Firmware· Grandstream
60%
v < 1.0.20.52
Affected range stops below 1.0.20.52, so it looks safe — our inference, not a vendor statement
UCM6510· Grandstream
60%
v < 1.0.20.52
Affected range stops below 1.0.20.52, so it looks safe — our inference, not a vendor statement
UCM6510 Firmware· Grandstream
60%
v < 1.0.20.52
Affected range stops below 1.0.20.52, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

Source: [email protected]
https://vulncheck.com/advisories/grand-stream-param-injection

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

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

CVSS

8.8HIGHVulnCheck
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-141

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