CVE-2026-2329Public exploitNetwork attack vector

Unauthenticated root code execution via unchecked identifier copy

Published Feb 18, 2026 · Updated Feb 18, 2026

Stack-based buffer overflow in Grandstream GXP1600 phones through 1.0.7.80 allows remote attackers to execute code as root. The unauthenticated /cgi-bin/api.values.get handler in /app/bin/gs_web copies each colon-delimited request identifier into a 64-byte stack buffer without enforcing its 63-character limit. The HTTP service listens on TCP port 80 by default, so an oversized request parameter can overwrite adjacent stack memory and control the program counter.

CVSS severity9.3
Critical
EPSS probability40.01%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in Grandstream GXP1600 phones through 1.0.7.80 allows remote attackers to execute code as root. The unauthenticated /cgi-bin/api.values.get handler in /app/bin/gs_web copies each colon-delimited request identifier into a 64-byte stack buffer without enforcing its 63-character limit. The HTTP service listens on TCP port 80 by default, so an oversized request parameter can overwrite adjacent stack memory and control the program counter.

The record

CVE
CVE-2026-2329
Published
Feb 18, 2026
Updated
Feb 18, 2026
Vendor
Grandstream Networks
Product
GXP1630
Classifications
CWE-121, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=1.0.7.80

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Grandstream Networks · GXP1630version=0 <=1.0.7.80
Grandstream Networks · GXP1628version=0 <=1.0.7.80
Grandstream Networks · GXP1620version=0 <=1.0.7.80
Grandstream Networks · GXP1625version=0 <=1.0.7.80
Grandstream Networks · GXP1610version=0 <=1.0.7.80
Grandstream Networks · GXP1615version=0 <=1.0.7.80

Published CVSS scores

9.3Rapid7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

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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-121Stack-based Buffer Overflow
T1190Exploit Public-Facing Application

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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