CVE-2018-0161

CRITICALNVD 6.39.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2022-03-03), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 6.3 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 4 sources updated this weekExploited in the wild
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 5%CVSS: 6.3Exploit: cisa kev · ssvc activeExposed: 0

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

A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS Software running on certain models of Cisco Catalyst Switches could allow an authenticated, remote attacker to cause a denial of service (DoS) condition, aka a GET MIB Object ID Denial of Service Vulnerability. The vulnerability is due to a condition that could occur when the affected software processes an SNMP read request that contains a request for the ciscoFlashMIB object ID (OID). An attacker could trigger this vulnerability by issuing an SNMP GET request for the ciscoFlashMIB OID on an affected device. A successful exploit could cause the affected device to restart due to a SYS-3-CPUHOG. This vulnerability affects the following Cisco devices if they are running a vulnerable release of Cisco IOS Software and are configured to use SNMP Version 2 (SNMPv2) or SNMP Version 3 (SNMPv3): Cisco Catalyst 2960-L Series Switches, Cisco Catalyst Digital Building Series Switches 8P, Cisco Catalyst Digital Building Series Switches 8U. Cisco Bug IDs: CSCvd89541.

CVSS v3
6.3
EG Score
9.0(high)
EG Risk
81(Attend)
EG Risk 81/100SSVC: Attend

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
Severity90% × 45%
Exploitation100% × 40%
Automatability0% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
5%
EPSS %ILE
91%
KEV
⚠ Exploited

Published

March 28, 2018

Last Modified

January 14, 2026

Advisory Details (4)

Auto-updated Jun 13, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa.
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-0161
generic🔴 Active Exploitation

Cisco IOS Software Simple Network Management Protocol GET MIB Object ID Denial of Service Vulnerability

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-snmp
generic
http://www.securitytracker.com/id/1040589
generic
http://www.securityfocus.com/bid/103573

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 57× in last 7d / 246× 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 698 total refreshes for this CVE.

  1. 2026-08-26 05:59 UTCGHSA enrichment
  2. 2026-08-26 01:56 UTCGHSA enrichment
  3. 2026-08-25 21:54 UTCGHSA enrichment
  4. 2026-08-25 17:52 UTCGHSA enrichment
  5. 2026-08-25 13:50 UTCEG score recompute
  6. 2026-08-25 13:50 UTCGHSA enrichment
  7. 2026-08-25 13:44 UTCEPSS rescore
  8. 2026-08-25 09:48 UTCGHSA enrichment
  9. 2026-08-25 05:46 UTCGHSA enrichment
  10. 2026-08-25 01:44 UTCGHSA enrichment
  11. 2026-08-24 21:42 UTCGHSA enrichment
  12. 2026-08-24 18:52 UTCCISA KEV update
  13. 2026-08-24 17:40 UTCEG score recompute
  14. 2026-08-24 17:40 UTCGHSA enrichment
  15. 2026-08-24 13:39 UTCGHSA enrichment
  16. 2026-08-24 09:37 UTCEG score recompute
  17. 2026-08-24 09:37 UTCGHSA enrichment
  18. 2026-08-24 05:35 UTCGHSA enrichment
  19. 2026-08-24 01:33 UTCGHSA enrichment
  20. 2026-08-23 21:30 UTCGHSA enrichment
  21. 2026-08-23 17:28 UTCGHSA enrichment
  22. 2026-08-23 13:26 UTCGHSA enrichment
  23. 2026-08-23 09:24 UTCGHSA enrichment
  24. 2026-08-23 05:21 UTCGHSA enrichment
  25. 2026-08-23 01:19 UTCEG score recompute
Show 75 more
  1. 2026-08-23 01:19 UTCGHSA enrichment
  2. 2026-08-23 00:14 UTCEPSS rescore
  3. 2026-08-22 21:18 UTCGHSA enrichment
  4. 2026-08-22 17:16 UTCGHSA enrichment
  5. 2026-08-22 13:14 UTCGHSA enrichment
  6. 2026-08-22 09:12 UTCGHSA enrichment
  7. 2026-08-22 05:10 UTCGHSA enrichment
  8. 2026-08-22 01:08 UTCEG score recompute
  9. 2026-08-22 01:07 UTCGHSA enrichment
  10. 2026-08-21 23:44 UTCEPSS rescore
  11. 2026-08-21 21:06 UTCGHSA enrichment
  12. 2026-08-21 17:04 UTCGHSA enrichment
  13. 2026-08-21 16:49 UTCCISA KEV update
  14. 2026-08-21 13:02 UTCGHSA enrichment
  15. 2026-08-21 09:00 UTCGHSA enrichment
  16. 2026-08-21 04:58 UTCGHSA enrichment
  17. 2026-08-21 00:56 UTCEG score recompute
  18. 2026-08-21 00:56 UTCGHSA enrichment
  19. 2026-08-20 20:55 UTCGHSA enrichment
  20. 2026-08-20 17:06 UTCCISA KEV update
  21. 2026-08-20 16:53 UTCGHSA enrichment
  22. 2026-08-20 12:51 UTCGHSA enrichment
  23. 2026-08-20 08:49 UTCGHSA enrichment
  24. 2026-08-20 04:48 UTCGHSA enrichment
  25. 2026-08-20 00:45 UTCGHSA enrichment
  26. 2026-08-19 20:40 UTCEG score recompute
  27. 2026-08-19 20:40 UTCGHSA enrichment
  28. 2026-08-19 17:33 UTCCISA KEV update
  29. 2026-08-19 16:59 UTCEPSS rescore
  30. 2026-08-19 16:38 UTCGHSA enrichment
  31. 2026-08-19 12:32 UTCGHSA enrichment
  32. 2026-08-19 08:30 UTCGHSA enrichment
  33. 2026-08-19 04:28 UTCGHSA enrichment
  34. 2026-08-19 00:23 UTCGHSA enrichment
  35. 2026-08-18 20:21 UTCGHSA enrichment
  36. 2026-08-18 16:58 UTCCISA KEV update
  37. 2026-08-18 16:19 UTCEG score recompute
  38. 2026-08-18 16:18 UTCGHSA enrichment
  39. 2026-08-18 13:43 UTCEPSS rescore
  40. 2026-08-18 12:14 UTCGHSA enrichment
  41. 2026-08-18 08:09 UTCGHSA enrichment
  42. 2026-08-18 04:04 UTCGHSA enrichment
  43. 2026-08-18 00:02 UTCGHSA enrichment
  44. 2026-08-17 19:59 UTCGHSA enrichment
  45. 2026-08-17 15:57 UTCEG score recompute
  46. 2026-08-17 15:57 UTCGHSA enrichment
  47. 2026-08-17 13:56 UTCCISA KEV update
  48. 2026-08-17 11:55 UTCGHSA enrichment
  49. 2026-08-17 07:53 UTCGHSA enrichment
  50. 2026-08-17 03:52 UTCGHSA enrichment
  51. 2026-08-16 23:50 UTCGHSA enrichment
  52. 2026-08-16 19:48 UTCGHSA enrichment
  53. 2026-08-16 15:46 UTCEG score recompute
  54. 2026-08-16 15:46 UTCGHSA enrichment
  55. 2026-08-16 14:51 UTCEPSS rescore
  56. 2026-08-16 11:44 UTCGHSA enrichment
  57. 2026-08-16 07:42 UTCGHSA enrichment
  58. 2026-08-16 03:41 UTCEG score recompute
  59. 2026-08-16 03:41 UTCGHSA enrichment
  60. 2026-08-16 02:10 UTCEPSS rescore
  61. 2026-08-15 23:39 UTCGHSA enrichment
  62. 2026-08-15 19:37 UTCGHSA enrichment
  63. 2026-08-15 15:35 UTCGHSA enrichment
  64. 2026-08-15 11:33 UTCGHSA enrichment
  65. 2026-08-15 07:31 UTCGHSA enrichment
  66. 2026-08-15 03:29 UTCEG score recompute
  67. 2026-08-15 03:29 UTCGHSA enrichment
  68. 2026-08-15 01:26 UTCEPSS rescore
  69. 2026-08-14 23:26 UTCGHSA enrichment
  70. 2026-08-14 19:24 UTCGHSA enrichment
  71. 2026-08-14 15:22 UTCGHSA enrichment
  72. 2026-08-14 11:20 UTCGHSA enrichment
  73. 2026-08-14 07:19 UTCGHSA enrichment
  74. 2026-08-14 03:17 UTCGHSA enrichment
  75. 2026-08-13 23:15 UTCEG score recompute

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Frequently asked(6)

What is CVE-2018-0161?
CVE-2018-0161 is a critical vulnerability published on March 28, 2018. A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS Software running on certain models of Cisco Catalyst Switches could allow an authenticated, remote attacker to cause a denial of service (DoS) condition, aka a GET MIB Object ID Denial of Service Vulnerability.…
When was CVE-2018-0161 disclosed?
CVE-2018-0161 was first published in the National Vulnerability Database on March 28, 2018, with the most recent update on January 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2018-0161 actively exploited?
Yes. CISA added CVE-2018-0161 to the Known Exploited Vulnerabilities catalog on March 3, 2022, affecting Cisco IOS Software. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2018-0161?
CVE-2018-0161 has a CVSS v3 base score of 6.3 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2018-0161?
CVE-2018-0161 affects Cisco IOS Software. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2018-0161?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-0161, 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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