CVE-2018-0197

MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2022-05-13. NVD baseline CVSS 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 6.5Exploit: 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 VLAN Trunking Protocol (VTP) subsystem of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to corrupt the internal VTP database on an affected device and cause a denial of service (DoS) condition. The vulnerability is due to a logic error in how the affected software handles a subset of VTP packets. An attacker could exploit this vulnerability by sending VTP packets in a sequence that triggers a timeout in the VTP message processing code of the affected software. A successful exploit could allow the attacker to impact the ability to create, modify, or delete VLANs and cause a DoS condition. There are workarounds that address this vulnerability. This vulnerability affects Cisco devices that are running a vulnerable release of Cisco IOS Software or Cisco IOS XE Software, are operating in VTP client mode or VTP server mode, and do not have a VTP domain name configured. The default configuration for Cisco devices that are running Cisco IOS Software or Cisco IOS XE Software and support VTP is to operate in VTP server mode with no domain name configured.

CVSS v3
6.5
EG Score
6.5(medium)
EG Risk
30(Track)
EG Risk 30/100SSVC: 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
Severity65% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
47%
KEV
Not listed

Published

October 5, 2018

Last Modified

October 30, 2025

References (4)

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 5× 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.

Showing the most recent 100 of 116 total refreshes for this CVE.

  1. 2026-08-19 16:59 UTCEPSS rescore
  2. 2026-08-18 13:43 UTCEPSS rescore
  3. 2026-08-16 14:51 UTCEPSS rescore
  4. 2026-08-16 02:10 UTCEPSS rescore
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  12. 2026-08-05 19:13 UTCEPSS rescore
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  18. 2026-07-28 15:32 UTCEPSS rescore
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  20. 2026-07-26 14:51 UTCEPSS rescore
  21. 2026-07-23 14:15 UTCEPSS rescore
  22. 2026-07-23 01:31 UTCEG score recompute
  23. 2026-07-22 22:11 UTCEG score recompute
  24. 2026-07-22 14:04 UTCEPSS rescore
  25. 2026-07-21 15:21 UTCEPSS rescore
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  1. 2026-07-20 17:04 UTCEPSS rescore
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  3. 2026-07-19 14:28 UTCEPSS rescore
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  5. 2026-07-19 02:26 UTCEPSS rescore
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  7. 2026-07-18 10:01 UTCEPSS rescore
  8. 2026-07-16 16:59 UTCEPSS rescore
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  10. 2026-07-15 16:55 UTCEPSS rescore
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  16. 2026-07-12 05:43 UTCEPSS rescore
  17. 2026-07-11 08:24 UTCEPSS rescore
  18. 2026-07-09 19:06 UTCEPSS rescore
  19. 2026-07-08 15:11 UTCEPSS rescore
  20. 2026-07-07 13:42 UTCEPSS rescore
  21. 2026-07-06 16:24 UTCEPSS rescore
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  23. 2026-07-06 02:20 UTCEPSS rescore
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  28. 2026-07-02 16:54 UTCEPSS rescore
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  30. 2026-06-30 23:19 UTCEPSS rescore
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  36. 2026-06-27 03:06 UTCEPSS rescore
  37. 2026-06-25 13:47 UTCEPSS rescore
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  40. 2026-06-23 21:30 UTCEPSS rescore
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  42. 2026-06-22 14:23 UTCEPSS rescore
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  44. 2026-06-21 14:54 UTCEPSS rescore
  45. 2026-06-21 14:54 UTCEPSS rescore
  46. 2026-06-21 01:57 UTCEPSS rescore
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  48. 2026-06-19 19:23 UTCEPSS rescore
  49. 2026-06-19 19:23 UTCEPSS rescore
  50. 2026-06-18 17:50 UTCEPSS rescore
  51. 2026-06-17 17:50 UTCEPSS rescore
  52. 2026-06-16 17:50 UTCEPSS rescore
  53. 2026-06-15 17:45 UTCEPSS rescore
  54. 2026-06-14 23:14 UTCEPSS rescore
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  56. 2026-06-13 22:58 UTCEPSS rescore
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  58. 2026-06-12 23:09 UTCEPSS rescore
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  60. 2026-06-11 13:57 UTCEPSS rescore
  61. 2026-06-10 22:15 UTCEPSS rescore
  62. 2026-06-10 13:19 UTCEPSS rescore
  63. 2026-06-08 14:14 UTCEPSS rescore
  64. 2026-06-08 14:14 UTCEPSS rescore
  65. 2026-06-07 15:22 UTCEPSS rescore
  66. 2026-06-07 15:22 UTCEPSS rescore
  67. 2026-06-06 13:45 UTCEPSS rescore
  68. 2026-06-06 13:45 UTCEPSS rescore
  69. 2026-06-05 22:44 UTCEPSS rescore
  70. 2026-06-05 22:44 UTCEPSS rescore
  71. 2026-06-05 06:08 UTCEPSS rescore
  72. 2026-06-05 06:08 UTCEPSS rescore
  73. 2026-06-04 13:10 UTCEPSS rescore
  74. 2026-06-04 13:10 UTCEPSS rescore
  75. 2026-06-02 20:11 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2018-0197?
CVE-2018-0197 is a medium vulnerability published on October 5, 2018. A vulnerability in the VLAN Trunking Protocol (VTP) subsystem of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to corrupt the internal VTP database on an affected device and cause a denial of service (DoS) condition. The vulnerability is due to a…
When was CVE-2018-0197 disclosed?
CVE-2018-0197 was first published in the National Vulnerability Database on October 5, 2018, with the most recent update on October 30, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2018-0197 actively exploited?
CVE-2018-0197 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 52.7% of all scored CVEs.
What is the CVSS score of CVE-2018-0197?
CVE-2018-0197 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2018-0197?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-0197, 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.

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