CVE-2018-0159

CRITICALNVD 7.59.0▲
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 7.5 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: 7%CVSS: 7.5Exploit: 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 implementation of Internet Key Exchange Version 1 (IKEv1) functionality in Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. The vulnerability is due to improper validation of specific IKEv1 packets. An attacker could exploit this vulnerability by sending crafted IKEv1 packets to an affected device during an IKE negotiation. A successful exploit could allow the attacker to cause an affected device to reload, resulting in a DoS condition. Cisco Bug IDs: CSCuj73916.

CVSS v3
7.5
EG Score
9.0(high)
EG Risk
96(Attend)
EG Risk 96/100SSVC: 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%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
7%
EPSS %ILE
94%
KEV
⚠ Exploited

Published

March 28, 2018

Last Modified

January 14, 2026

Advisory Details (4)

Auto-updated Jun 4, 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-2018-0159
generic🔴 Active Exploitation

Cisco IOS and IOS XE Software Internet Key Exchange Version 1 Denial of Service Vulnerability

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-ike-dos
generic
http://www.securitytracker.com/id/1040595
generic
http://www.securityfocus.com/bid/103562

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 58× in last 7d / 248× 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 819 total refreshes for this CVE.

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

Frequently asked(6)

What is CVE-2018-0159?
CVE-2018-0159 is a critical vulnerability published on March 28, 2018. A vulnerability in the implementation of Internet Key Exchange Version 1 (IKEv1) functionality in Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. The vulnerability…
When was CVE-2018-0159 disclosed?
CVE-2018-0159 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-2018-0159 actively exploited?
Yes. CISA added CVE-2018-0159 to the Known Exploited Vulnerabilities catalog on March 3, 2022, affecting Cisco IOS Software and Cisco IOS XE Software. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2018-0159?
CVE-2018-0159 has a CVSS v3 base score of 7.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2018-0159?
CVE-2018-0159 affects Cisco IOS Software and Cisco IOS XE 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-2018-0159?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-0159, 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-2018-0159

Explore →

Is Your Infrastructure Affected by CVE-2018-0159?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs