CVE-2026-33389

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory published 2026-09-08. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 0

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

An improper certificate/host key validation vulnerability was discovered in the Smart Polling functionality, which established encrypted connections to target devices without validating the remote host's identity, and no option was provided to enable it. A man-in-the-middle attacker positioned between a sensor and a polled device can, during a polling session, impersonate the device and intercept the communication, including the credentials used to access it. The captured credentials can then be replayed to authenticate against the device itself or against other devices sharing the same credentials, allowing the attacker to access and tamper with the device's data and to disrupt its operations.

CVSS v3
7.5
EG Score
7.5(high)
EG Risk
34(Track)
EG Risk 34/100SSVC: 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
Severity75% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
2%
KEV
Not listed

Published

September 8, 2026

Last Modified

September 8, 2026

Advisory Details (1)

Auto-updated Sep 8, 2026
No patch confirmed yet.
generic

NN-2026:20-01 - Disabled and non-configurable certificate/host key validation in Smart Polling in Guardian/CMC before 26.3.0 and Arc before v2.7.0 - CVE-2026-33389 | Product Security Incident Response Portal

https://security.nozominetworks.com/NN-2026:20-01

Vendor Advisories for CVE-2026-33389(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 28× in last 7d / 46× 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. 2026-09-18 22:01 UTCEG score recompute
  2. 2026-09-18 22:01 UTCGHSA enrichment
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 19:28 UTCEPSS rescore
  5. 2026-09-18 09:24 UTCGHSA enrichment
  6. 2026-09-17 20:47 UTCEG score recompute
  7. 2026-09-17 20:47 UTCGHSA enrichment
  8. 2026-09-17 19:30 UTCEPSS rescore
  9. 2026-09-17 08:10 UTCGHSA enrichment
  10. 2026-09-16 19:32 UTCEG score recompute
  11. 2026-09-16 19:31 UTCGHSA enrichment
  12. 2026-09-16 14:08 UTCEPSS rescore
  13. 2026-09-16 06:54 UTCEG score recompute
  14. 2026-09-16 06:54 UTCGHSA enrichment
  15. 2026-09-16 05:15 UTCEPSS rescore
  16. 2026-09-15 18:17 UTCGHSA enrichment
  17. 2026-09-15 05:30 UTCEG score recompute
  18. 2026-09-15 05:29 UTCGHSA enrichment
  19. 2026-09-15 03:11 UTCEPSS rescore
  20. 2026-09-14 16:44 UTCGHSA enrichment
  21. 2026-09-14 04:07 UTCEG score recompute
  22. 2026-09-14 04:07 UTCGHSA enrichment
  23. 2026-09-13 16:47 UTCEPSS rescore
  24. 2026-09-13 15:30 UTCGHSA enrichment
  25. 2026-09-13 02:53 UTCEG score recompute
Show 21 more
  1. 2026-09-13 02:53 UTCGHSA enrichment
  2. 2026-09-12 15:01 UTCEPSS rescore
  3. 2026-09-12 14:16 UTCGHSA enrichment
  4. 2026-09-12 01:39 UTCEG score recompute
  5. 2026-09-12 01:39 UTCGHSA enrichment
  6. 2026-09-11 14:53 UTCEPSS rescore
  7. 2026-09-11 13:02 UTCEG score recompute
  8. 2026-09-11 13:02 UTCGHSA enrichment
  9. 2026-09-11 09:37 UTCEPSS rescore
  10. 2026-09-11 00:25 UTCGHSA enrichment
  11. 2026-09-10 11:48 UTCEG score recompute
  12. 2026-09-10 11:48 UTCGHSA enrichment
  13. 2026-09-10 09:34 UTCEPSS rescore
  14. 2026-09-09 23:10 UTCGHSA enrichment
  15. 2026-09-09 08:26 UTCGHSA enrichment
  16. 2026-09-08 19:50 UTCGHSA enrichment
  17. 2026-09-08 15:36 UTCEG score recompute
  18. 2026-09-08 15:35 UTCGHSA enrichment
  19. 2026-09-08 14:29 UTCEG score recompute
  20. 2026-09-08 14:08 UTCEG score recompute
  21. 2026-09-08 14:04 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-33389?
CVE-2026-33389 is a high vulnerability published on September 8, 2026. An improper certificate/host key validation vulnerability was discovered in the Smart Polling functionality, which established encrypted connections to target devices without validating the remote host's identity, and no option was provided to enable it. A man-in-the-middle attacker positioned…
When was CVE-2026-33389 disclosed?
CVE-2026-33389 was first published in the National Vulnerability Database on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-33389 actively exploited?
CVE-2026-33389 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 98.0% of all scored CVEs.
What is the CVSS score of CVE-2026-33389?
CVE-2026-33389 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-33389?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-33389, 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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