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 — 3 sources updated this weekExploited in the wild
9.0EG
EchelonGraph verdictMitigate nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 4.1%CVSS: 6.3Exploit: cisa kev · ssvc activeExposed services: Not assessed

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

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
9.0CRITICALhigh confidence
EG Risk
81
EG Risk 81/100CISA SSVC

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%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
4.1%
EPSS %ILE
90th
KEV
⚠ Exploited

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation active (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

March 28, 2018

Last Modified

January 14, 2026

Advisory Details (4)

Auto-updated Jun 13, 2026
⚠️ Active exploitation confirmed. No fix on record yet. Sources: cisa.
cisa🔴 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 52× in last 7d / 239× 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 1,061 total refreshes for this CVE.

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

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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 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 attention. No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation, and watch the vendor's advisory for the fix.
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 (CRITICAL).
Which products are affected by CVE-2018-0161?
CVE-2018-0161 affects Cisco IOS Software.
How do I remediate CVE-2018-0161?
No fix for CVE-2018-0161 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix.

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