CVE-2026-2329

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-02-18. the CNA's CVSS baseline 9.3; sources differ by 0.5.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:rapid7, ghsa
Weaponized
9.8EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • Public exploit code is available (Metasploit, ssvc poc, epss top5pct, public exploit)
CISA-KEV: Not listedEPSS PROB: 40%CVSS: 9.8Exploit: Metasploit · ssvc poc · epss top5pct · public exploitExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
85(Attend)
EG Risk 85/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation65% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
40%
EPSS %ILE
98%
KEV
Not listed

Published

February 18, 2026

Last Modified

June 17, 2026

Advisory Details (4)

Auto-updated Jul 27, 2026
Upstream fix merged — awaiting tagged release. Sources: github_pr.
github_pr

Add exploit (CVE-2026-2329) and auxiliary modules for the Grandstream GXP1600 series

Fix merged in rapid7/metasploit-framework PR #20983 on 2026-02-24 — awaiting tagged release

https://github.com/rapid7/metasploit-framework/pull/20983
generic
https://firmware.grandstream.com/Release_Note_GXP16xx_1.0.7.81.pdf
generic

Vulnerability

https://psirt.grandstream.com/
generic

CVE-2026-2329: Critical Unauthenticated Stack Buffer Overflow in Grandstream GXP1600 VoIP Phones (FIXED)

https://www.rapid7.com/blog/post/ve-cve-2026-2329-critical-unauthenticated-stack-buffer-overflow-in-grandstream-gxp1600-voip-phones-fixed

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 2× in last 7d / 2× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-27 12:55 UTCEG score recompute
  2. 2026-07-27 12:55 UTCGHSA enrichment

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 Metasploit module). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Metasploitexploit/linux/http/grandstream_gxp1600_unauth_rce✓ verified
    First seen Feb 18, 2026

    GrandStream GXP1600 Unauthenticated Remote Code Execution

    Open source ↗

Frequently asked(5)

What is CVE-2026-2329?
CVE-2026-2329 is a critical vulnerability published on February 18, 2026. 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…
When was CVE-2026-2329 disclosed?
CVE-2026-2329 was first published in the National Vulnerability Database on February 18, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-2329 actively exploited?
CVE-2026-2329 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 40% probability of exploitation in the next 30 days, which ranks it in the top 1.5% of all scored CVEs.
What is the CVSS score of CVE-2026-2329?
CVE-2026-2329 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-2329?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-2329, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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