CVE-2026-20177

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

Score 5.3 from GitHub Security Advisory published 2026-08-19. a secondary CVSS source baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: None knownExposed: 0

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

A vulnerability in the handling of management plane packets by Cisco Industrial Ethernet (IE) 1000 Series Switches could allow an unauthenticated, remote attacker to cause the device manager, SSH, or API to become inaccessible.This vulnerability is due to insufficient protection against management plane flooding attacks. An attacker could exploit this vulnerability by sending a high rate of ICMP, SSH, or HTTP traffic to an affected device. A successful exploit could allow the attacker to cause the CPU of the device to increase, resulting in a denial of service (DoS) condition on the device manager web GUI, SSH, or API. Data traffic through the device is not affected.

CVSS v3
5.3
EG Score
5.3(medium)
EG Risk
39(Track)
EG Risk 39/100SSVC: 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
Severity53% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
33%
KEV
Not listed

Published

August 19, 2026

Last Modified

August 20, 2026

Advisory Details (1)

Auto-updated Aug 19, 2026
No patch confirmed yet.
generic

Cisco Industrial Ethernet 1000 Series Switches Denial of Service Vulnerability

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ie1k-uxq86Lnx

Vendor Advisories for CVE-2026-20177(2)

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 19× in last 7d / 83× 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. 2026-09-19 13:47 UTCEG score recompute
  2. 2026-09-19 13:47 UTCGHSA enrichment
  3. 2026-09-18 19:27 UTCEPSS rescore
  4. 2026-09-18 12:40 UTCEG score recompute
  5. 2026-09-18 12:40 UTCGHSA enrichment
  6. 2026-09-17 11:31 UTCEG score recompute
  7. 2026-09-17 11:31 UTCGHSA enrichment
  8. 2026-09-16 14:07 UTCEPSS rescore
  9. 2026-09-16 10:23 UTCEG score recompute
  10. 2026-09-16 10:23 UTCGHSA enrichment
  11. 2026-09-16 05:15 UTCEPSS rescore
  12. 2026-09-15 09:17 UTCEG score recompute
  13. 2026-09-15 09:17 UTCGHSA enrichment
  14. 2026-09-14 08:10 UTCEG score recompute
  15. 2026-09-14 08:10 UTCGHSA enrichment
  16. 2026-09-13 16:46 UTCEPSS rescore
  17. 2026-09-13 07:03 UTCEG score recompute
  18. 2026-09-13 07:03 UTCGHSA enrichment
  19. 2026-09-12 15:00 UTCEPSS rescore
  20. 2026-09-12 05:57 UTCEG score recompute
  21. 2026-09-12 05:57 UTCGHSA enrichment
  22. 2026-09-11 14:52 UTCEPSS rescore
  23. 2026-09-11 09:36 UTCEPSS rescore
  24. 2026-09-11 04:50 UTCEG score recompute
  25. 2026-09-11 04:50 UTCGHSA enrichment
Show 63 more
  1. 2026-09-10 09:34 UTCEPSS rescore
  2. 2026-09-10 03:43 UTCGHSA enrichment
  3. 2026-09-09 02:36 UTCEG score recompute
  4. 2026-09-09 02:36 UTCGHSA enrichment
  5. 2026-09-08 22:00 UTCEPSS rescore
  6. 2026-09-07 16:01 UTCEPSS rescore
  7. 2026-09-07 15:41 UTCEG score recompute
  8. 2026-09-07 15:41 UTCGHSA enrichment
  9. 2026-09-06 13:47 UTCEPSS rescore
  10. 2026-09-06 11:16 UTCEG score recompute
  11. 2026-09-06 11:16 UTCGHSA enrichment
  12. 2026-09-05 10:06 UTCEG score recompute
  13. 2026-09-05 10:06 UTCGHSA enrichment
  14. 2026-09-04 08:57 UTCEG score recompute
  15. 2026-09-04 08:57 UTCGHSA enrichment
  16. 2026-09-04 05:06 UTCEPSS rescore
  17. 2026-09-03 07:46 UTCEG score recompute
  18. 2026-09-03 07:46 UTCGHSA enrichment
  19. 2026-09-02 14:11 UTCEPSS rescore
  20. 2026-09-02 06:37 UTCEG score recompute
  21. 2026-09-02 06:37 UTCGHSA enrichment
  22. 2026-09-01 13:53 UTCEPSS rescore
  23. 2026-09-01 05:31 UTCEG score recompute
  24. 2026-09-01 05:30 UTCGHSA enrichment
  25. 2026-09-01 04:39 UTCEPSS rescore
  26. 2026-08-31 04:13 UTCEG score recompute
  27. 2026-08-31 04:13 UTCGHSA enrichment
  28. 2026-08-30 19:17 UTCEPSS rescore
  29. 2026-08-30 03:00 UTCEG score recompute
  30. 2026-08-30 03:00 UTCGHSA enrichment
  31. 2026-08-30 01:22 UTCEPSS rescore
  32. 2026-08-29 01:54 UTCEG score recompute
  33. 2026-08-29 01:54 UTCGHSA enrichment
  34. 2026-08-28 21:41 UTCEPSS rescore
  35. 2026-08-28 00:28 UTCEG score recompute
  36. 2026-08-28 00:27 UTCGHSA enrichment
  37. 2026-08-27 14:25 UTCEPSS rescore
  38. 2026-08-26 23:18 UTCEG score recompute
  39. 2026-08-26 23:18 UTCGHSA enrichment
  40. 2026-08-26 14:46 UTCEPSS rescore
  41. 2026-08-25 22:11 UTCEG score recompute
  42. 2026-08-25 22:11 UTCGHSA enrichment
  43. 2026-08-25 13:48 UTCEPSS rescore
  44. 2026-08-24 21:04 UTCEG score recompute
  45. 2026-08-24 21:04 UTCGHSA enrichment
  46. 2026-08-23 19:57 UTCEG score recompute
  47. 2026-08-23 19:57 UTCGHSA enrichment
  48. 2026-08-23 00:19 UTCEPSS rescore
  49. 2026-08-22 18:51 UTCEG score recompute
  50. 2026-08-22 18:51 UTCGHSA enrichment
  51. 2026-08-21 23:49 UTCEPSS rescore
  52. 2026-08-21 17:44 UTCEG score recompute
  53. 2026-08-21 17:44 UTCGHSA enrichment
  54. 2026-08-20 22:55 UTCEPSS rescore
  55. 2026-08-20 16:37 UTCEG score recompute
  56. 2026-08-20 16:37 UTCGHSA enrichment
  57. 2026-08-20 16:07 UTCEG score recompute
  58. 2026-08-20 16:07 UTCGHSA enrichment
  59. 2026-08-20 13:28 UTCEG score recompute
  60. 2026-08-20 13:28 UTCGHSA enrichment
  61. 2026-08-19 17:23 UTCEG score recompute
  62. 2026-08-19 16:22 UTCEG score recompute
  63. 2026-08-19 16:22 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-20177?
CVE-2026-20177 is a medium vulnerability published on August 19, 2026. A vulnerability in the handling of management plane packets by Cisco Industrial Ethernet (IE) 1000 Series Switches could allow an unauthenticated, remote attacker to cause the device manager, SSH, or API to become inaccessible.This vulnerability is due to insufficient protection against…
When was CVE-2026-20177 disclosed?
CVE-2026-20177 was first published in the National Vulnerability Database on August 19, 2026, with the most recent update on August 20, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-20177 actively exploited?
CVE-2026-20177 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 67.1% of all scored CVEs.
What is the CVSS score of CVE-2026-20177?
CVE-2026-20177 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-20177?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-20177, 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-2026-20177

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