CVE-2026-77683

CRITICALPre-NVD 9.99.9—
EchelonGraph scoreHIGH confidence

Score 9.9 from GitHub Security Advisory (severity: HIGH) published 2026-08-21. a secondary CVSS source baseline 9.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: ghsa, secondary
Trending — 4 sources updated this weekElevated
9.9EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: —CVSS: 9.9Exploit: Elevated riskExposed: 0

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

A security flaw has been discovered in Comfast CF-N1-S 2.6.0.1. Affected by this issue is the function system of the file /cgi-bin/mbox-config?method=SET§ion=ntp_timezone. The manipulation of the argument timestr results in command injection. The attack can be launched remotely. The exploit has been released to the public and may be used for attacks.

CVSS v3
9.9
EG Score
9.9(high)
EG Risk
61(Track*)
EG Risk 61/100SSVC: Track*

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
Severity99% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
—
EPSS %ILE
—
KEV
Not listed

Published

August 21, 2026

Last Modified

August 21, 2026

Advisory Details (1)

Auto-updated Aug 21, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

Comfast CF-N1-S V2.6.0.1 Contains an Unauthorized Command Injection Vulnerability(RCE) · Issue #8 · AdminSafe/CVE · GitHub

https://github.com/AdminSafe/CVE/issues/8

Vendor Advisories for CVE-2026-77683(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 12× 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. 2026-08-21 23:02 UTCGHSA enrichment
  2. 2026-08-21 18:41 UTCGHSA enrichment
  3. 2026-08-21 14:21 UTCEG score recompute
  4. 2026-08-21 14:21 UTCGHSA enrichment
  5. 2026-08-21 14:19 UTCNVD updateCVSS v4 → 8.6
  6. 2026-08-21 14:10 UTCEG score recompute
  7. 2026-08-21 14:10 UTCGHSA enrichment
  8. 2026-08-21 14:09 UTCMITRE cvelistV5CVSS v4 → 9.4
  9. 2026-08-21 11:21 UTCEG score recompute
  10. 2026-08-21 11:17 UTCNVD updateCVSS v4 → 8.6
  11. 2026-08-21 10:24 UTCEG score recompute
  12. 2026-08-21 10:24 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(4)

What is CVE-2026-77683?
CVE-2026-77683 is a critical vulnerability published on August 21, 2026. A security flaw has been discovered in Comfast CF-N1-S 2.6.0.1. Affected by this issue is the function system of the file /cgi-bin/mbox-config?method=SET&section=ntp_timezone. The manipulation of the argument timestr results in command injection. The attack can be launched remotely. The exploit has…
When was CVE-2026-77683 disclosed?
CVE-2026-77683 was first published in the National Vulnerability Database on August 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
What is the CVSS score of CVE-2026-77683?
CVE-2026-77683 has a CVSS v3 base score of 9.9 (NVD).
How do I remediate CVE-2026-77683?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-77683, 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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