CVE-2018-0172

CRITICALNVD 8.69.0▲
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 8.6 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: 8%CVSS: 8.6Exploit: 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 DHCP option 82 encapsulation functionality of 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 exists because the affected software performs incomplete input validation of option 82 information that it receives in DHCP Version 4 (DHCPv4) packets from DHCP relay agents. An attacker could exploit this vulnerability by sending a crafted DHCPv4 packet to an affected device. A successful exploit could allow the attacker to cause a heap overflow condition on the affected device, which will cause the device to reload and result in a DoS condition. Cisco Bug IDs: CSCvg62730.

CVSS v3
8.6
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
8%
EPSS %ILE
94%
KEV
⚠ Exploited

Published

March 28, 2018

Last Modified

January 14, 2026

Advisory Details (4)

Auto-updated Jun 2, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet.
generic
http://www.securitytracker.com/id/1040591
generic
http://www.securityfocus.com/bid/103552
generic

[R1] Cisco IOS and IOS XE Multiple Memory Corruption Vulnerabilities - Research Advisory | Tenable®

https://www.tenable.com/security/research/tra-2018-06
generic🔴 Active Exploitation

Cisco IOS and IOS XE Software DHCP Version 4 Relay Heap Overflow Denial of Service Vulnerability

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-dhcpr1

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 55× in last 7d / 231× 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 767 total refreshes for this CVE.

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

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Frequently asked(6)

What is CVE-2018-0172?
CVE-2018-0172 is a critical vulnerability published on March 28, 2018. A vulnerability in the DHCP option 82 encapsulation functionality of 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 exists because the affected…
When was CVE-2018-0172 disclosed?
CVE-2018-0172 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-2018-0172 actively exploited?
Yes. CISA added CVE-2018-0172 to the Known Exploited Vulnerabilities catalog on March 3, 2022, affecting Cisco IOS and IOS XE Software. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2018-0172?
CVE-2018-0172 has a CVSS v3 base score of 8.6 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2018-0172?
CVE-2018-0172 affects Cisco IOS and 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-2018-0172?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-0172, 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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