CVE-2026-2329GXP1610 Stack Buffer Overflow
Grandstream GXP1600 VoIP Phones - Unauthenticated stack buffer overflow
Published Feb 18, 2026 · Updated Feb 18, 2026
Key Facts
Patch immediately- CVE-2026-2329 is a critical-severity vulnerability (CVSS 9.3 v4) affecting Gxp1610 Firmware (Grandstream), Gxp1615 Firmware (Grandstream), Gxp1620 Firmware (Grandstream) and 9 more products.
- It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
- EPSS estimates a 42% probability of exploitation in the next 30 days.
- Fixed versions are available, including Gxp1610 Firmware 1.0.7.81, Gxp1615 Firmware 1.0.7.81, Gxp1620 Firmware 1.0.7.81.
- Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
Scores
CVSS v4
9.3
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS (30-day exploit likelihood)
42%
Higher than 98.6% of all scored CVEs
Exploit maturity
Weaponized
ATLAS score
57/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Not listed
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Weaponized
Public exploit code
2
Proof-of-concept links
In-the-wild evidence
0
Reports of active use
Advisories And Exploit References
Description
An unauthenticated stack-based buffer overflow vulnerability exists in the HTTP API endpoint /cgi-bin/api.values.get. A remote attacker can leverage this vulnerability to achieve unauthenticated remote code execution (RCE) with root privileges on a target device. The vulnerability affects all six device models in the series: GXP1610, GXP1615, GXP1620, GXP1625, GXP1628, and GXP1630.
Affected Products
12 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Gxp1610 FirmwareGrandstream | See advisory | 1.0.7.81 |
| Gxp1615 FirmwareGrandstream | See advisory | 1.0.7.81 |
| Gxp1620 FirmwareGrandstream | See advisory | 1.0.7.81 |
| Gxp1625 FirmwareGrandstream | See advisory | 1.0.7.81 |
| Gxp1628 FirmwareGrandstream | See advisory | 1.0.7.81 |
Patched Releases
Gxp1610 Firmware
1.0.7.81
Gxp1615 Firmware
1.0.7.81
Gxp1620 Firmware
1.0.7.81
Gxp1625 Firmware
1.0.7.81
Gxp1628 Firmware
1.0.7.81
Gxp1630 Firmware
1.0.7.81
Timeline
Publicly disclosed
Feb 18, 2026
Weakness Type
- CWE-121 Stack-based Buffer Overflow
References
FAQ
Common Questions.
An unauthenticated stack-based buffer overflow vulnerability exists in the HTTP API endpoint /cgi-bin/api.values.get.
Affected: Gxp1610 Firmware (Grandstream); Gxp1615 Firmware (Grandstream); Gxp1620 Firmware (Grandstream), among others. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including Gxp1610 Firmware 1.0.7.81, Gxp1615 Firmware 1.0.7.81, Gxp1620 Firmware 1.0.7.81.
Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
Is CVE-2026-2329 On Your Attack Surface?
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