CVE-2026-74233

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-27. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 3%CVSS: 9.8Exploit: None knownExposed: 0

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

Zbtlink WE1326, WE357, WE5926, WE5926-WD, WE826-Q, WE826-T2, WE826-WD, WG108, and WG3526 firmware 19.1101, Zbtlink WE2426-C firmware 19.1112, Zbtlink WE5926-EC_QP firmware 20.0516, Zbtlink WF3526-P firmware 19.051, CTN720-W1, LF-1541, and MT7620N firmware 19.1101, and WRC1 firmware 20.0622 contain an unauthenticated command injection in the infosrvd service (UDP/9992). A remote unauthenticated attacker can send a crafted UDP packet to execute arbitrary commands as root. The service's authentication uses a hardcoded salt and an all-zero wildcard MAC bypass, rendering it ineffective.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
50(Track)
EG Risk 50/100SSVC: 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
Severity98% × 45%
Exploitation3% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
3%
EPSS %ILE
84%
KEV
Not listed

Published

August 27, 2026

Last Modified

August 27, 2026

Advisory Details (2)

Auto-updated Aug 27, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet.
generic

Zbtlink MQWrt infosrvd Command Injection | Advisories | VulnCheck

https://www.vulncheck.com/advisories/zbtlink-mqwrt-infosrvd-command-injection
generic🔴 Active Exploitation

Chinese Implants in the Supply Chain | Blog | VulnCheck

http://vulncheck.com/blog/zbt-darklantern-speakingstone

Vendor Advisories for CVE-2026-74233(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 23× in last 7d / 23× 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. 2026-08-30 04:09 UTCEG score recompute
  2. 2026-08-30 04:09 UTCGHSA enrichment
  3. 2026-08-30 01:22 UTCEPSS rescore
  4. 2026-08-30 00:09 UTCGHSA enrichment
  5. 2026-08-29 20:08 UTCGHSA enrichment
  6. 2026-08-29 16:08 UTCGHSA enrichment
  7. 2026-08-29 12:07 UTCGHSA enrichment
  8. 2026-08-29 07:58 UTCGHSA enrichment
  9. 2026-08-29 03:57 UTCGHSA enrichment
  10. 2026-08-28 23:56 UTCEG score recompute
  11. 2026-08-28 23:56 UTCGHSA enrichment
  12. 2026-08-28 21:42 UTCEPSS rescore
  13. 2026-08-28 17:44 UTCGHSA enrichment
  14. 2026-08-28 13:38 UTCGHSA enrichment
  15. 2026-08-28 09:36 UTCGHSA enrichment
  16. 2026-08-28 05:32 UTCGHSA enrichment
  17. 2026-08-28 01:26 UTCGHSA enrichment
  18. 2026-08-27 21:27 UTCGHSA enrichment
  19. 2026-08-27 17:27 UTCEG score recompute
  20. 2026-08-27 17:27 UTCGHSA enrichment
  21. 2026-08-27 13:32 UTCEG score recompute
  22. 2026-08-27 12:59 UTCEG score recompute
  23. 2026-08-27 12:58 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-74233?
CVE-2026-74233 is a critical vulnerability published on August 27, 2026. Zbtlink WE1326, WE357, WE5926, WE5926-WD, WE826-Q, WE826-T2, WE826-WD, WG108, and WG3526 firmware 19.1101, Zbtlink WE2426-C firmware 19.1112, Zbtlink WE5926-EC_QP firmware 20.0516, Zbtlink WF3526-P firmware 19.051, CTN720-W1, LF-1541, and MT7620N firmware 19.1101, and WRC1 firmware 20.0622 contain…
When was CVE-2026-74233 disclosed?
CVE-2026-74233 was first published in the National Vulnerability Database on August 27, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-74233 actively exploited?
CVE-2026-74233 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3% probability of exploitation in the next 30 days, which ranks it in the top 15.6% of all scored CVEs.
What is the CVSS score of CVE-2026-74233?
CVE-2026-74233 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-74233?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-74233, 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

Explore the affected products and dependency analysis for CVE-2026-74233

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