CVE-2018-15391

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2022-05-13. NVD baseline CVSS 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.5EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.4%CVSS: 7.5Exploit: None knownExposed 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 certain IPv4 fragment-processing functions of Cisco Remote PHY Software could allow an unauthenticated, remote attacker to impact traffic passing through a device, potentially causing a denial of service (DoS) condition. The vulnerability is due to the affected software not validating and calculating certain numerical values in IPv4 packets that are sent to an affected device. An attacker could exploit this vulnerability by sending malformed IPv4 traffic to an affected device. A successful exploit could allow the attacker to disrupt the flow of certain IPv4 traffic passing through an affected device, which could result in a DoS condition.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
49
EG Risk 49/100CISA 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
Severity75% × 45%
Exploitation1% × 40%
Automatability100% × 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
1.4%
EPSS %ILE
71st
KEV
Not listed

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 none (CISA Vulnrichment) · Automatable yes (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

October 5, 2018

Last Modified

November 21, 2024

References (2)

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 27× 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 158 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2018-15391?
CVE-2018-15391 is a high vulnerability published on October 5, 2018. A vulnerability in certain IPv4 fragment-processing functions of Cisco Remote PHY Software could allow an unauthenticated, remote attacker to impact traffic passing through a device, potentially causing a denial of service (DoS) condition. The vulnerability is due to the affected software not…
When was CVE-2018-15391 disclosed?
CVE-2018-15391 was first published on October 5, 2018, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2018-15391 actively exploited?
CVE-2018-15391 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.4% probability of exploitation in the next 30 days (71st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2018-15391?
CVE-2018-15391 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2018-15391?
No fix for CVE-2018-15391 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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