CVE-2019-1751

HIGHNVD 8.68.6—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.6 under NVD CVSS v3. EPSS exploit probability: 2.5% (84th percentile of EPSS-scored CVEs). GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
8.6EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2.5%CVSS: 8.6Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A vulnerability in the Network Address Translation 64 (NAT64) functions of Cisco IOS Software could allow an unauthenticated, remote attacker to cause either an interface queue wedge or a device reload. The vulnerability is due to the incorrect handling of certain IPv4 packet streams that are sent through the device. An attacker could exploit this vulnerability by sending specific IPv4 packet streams through the device. An exploit could allow the attacker to either cause an interface queue wedge or a device reload, resulting in a denial of service (DoS) condition.

CVSS v3
8.6
EG Score
8.6HIGHmedium confidence
EG Risk
55
EG Risk 55/100CISA 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
Severity86% × 45%
Exploitation3% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
2.5%
EPSS %ILE
84th
KEV
Not listed

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

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

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

March 28, 2019

Last Modified

November 21, 2024

Advisory Details (2)

Auto-updated Sep 1, 2026
Patch available.
generic

Cisco IOS Software NAT64 Denial of Service Vulnerability

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190327-nat64
generic

CVE-2019-1751 - PSIRT.COM

http://www.securityfocus.com/bid/107601

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 4× in last 7d / 24× 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 151 total refreshes for this CVE.

  1. 2026-10-05 17:39 UTCEPSS rescore
  2. 2026-10-03 14:22 UTCEPSS rescore
  3. 2026-09-30 14:59 UTCEPSS rescore
  4. 2026-09-30 10:14 UTCEG score recompute
  5. 2026-09-28 13:46 UTCEPSS rescore
  6. 2026-09-27 13:40 UTCEPSS rescore
  7. 2026-09-26 15:54 UTCEPSS rescore
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  9. 2026-09-26 00:20 UTCEPSS rescore
  10. 2026-09-24 13:59 UTCEPSS rescore
  11. 2026-09-23 13:43 UTCEPSS rescore
  12. 2026-09-22 14:43 UTCEPSS rescore
  13. 2026-09-21 20:28 UTCEPSS rescore
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  15. 2026-09-18 19:22 UTCEPSS rescore
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  20. 2026-09-12 14:56 UTCEPSS rescore
  21. 2026-09-11 14:48 UTCEPSS rescore
  22. 2026-09-11 09:32 UTCEPSS rescore
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  24. 2026-09-06 13:44 UTCEPSS rescore
  25. 2026-09-05 15:24 UTCEPSS rescore
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  1. 2026-09-04 13:56 UTCEPSS rescore
  2. 2026-09-02 14:07 UTCEPSS rescore
  3. 2026-09-01 03:32 UTCEPSS rescore
  4. 2026-08-30 19:13 UTCEPSS rescore
  5. 2026-08-30 01:18 UTCEPSS rescore
  6. 2026-08-28 21:36 UTCEPSS rescore
  7. 2026-08-27 14:21 UTCEPSS rescore
  8. 2026-08-26 14:42 UTCEPSS rescore
  9. 2026-08-25 13:45 UTCEPSS rescore
  10. 2026-08-24 14:11 UTCEPSS rescore
  11. 2026-08-21 23:45 UTCEPSS rescore
  12. 2026-08-20 22:51 UTCEPSS rescore
  13. 2026-08-19 17:00 UTCEPSS rescore
  14. 2026-08-18 13:44 UTCEPSS rescore
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  17. 2026-08-16 02:10 UTCEPSS rescore
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  19. 2026-08-12 13:47 UTCEPSS rescore
  20. 2026-08-09 13:43 UTCEPSS rescore
  21. 2026-08-08 16:33 UTCEPSS rescore
  22. 2026-08-07 16:23 UTCEPSS rescore
  23. 2026-08-06 13:43 UTCEPSS rescore
  24. 2026-08-05 19:13 UTCEPSS rescore
  25. 2026-08-04 15:05 UTCEPSS rescore
  26. 2026-08-02 02:23 UTCEPSS rescore
  27. 2026-08-01 04:12 UTCEPSS rescore
  28. 2026-07-30 16:24 UTCEPSS rescore
  29. 2026-07-30 01:27 UTCEPSS rescore
  30. 2026-07-28 15:32 UTCEPSS rescore
  31. 2026-07-26 14:51 UTCEPSS rescore
  32. 2026-07-25 14:14 UTCEPSS rescore
  33. 2026-07-24 14:14 UTCEPSS rescore
  34. 2026-07-24 14:14 UTCEPSS rescore
  35. 2026-07-23 14:15 UTCEPSS rescore
  36. 2026-07-23 01:42 UTCEG score recompute
  37. 2026-07-22 22:22 UTCEG score recompute▲ 1.10
  38. 2026-07-22 14:05 UTCEPSS rescore
  39. 2026-07-21 15:22 UTCEPSS rescore
  40. 2026-07-21 15:22 UTCEPSS rescore
  41. 2026-07-20 17:04 UTCEPSS rescore
  42. 2026-07-20 17:04 UTCEPSS rescore
  43. 2026-07-19 14:28 UTCEPSS rescore
  44. 2026-07-19 14:28 UTCEPSS rescore
  45. 2026-07-19 02:26 UTCEPSS rescore
  46. 2026-07-19 02:26 UTCEPSS rescore
  47. 2026-07-18 10:01 UTCEPSS rescore
  48. 2026-07-16 16:59 UTCEPSS rescore
  49. 2026-07-16 16:59 UTCEPSS rescore
  50. 2026-07-15 16:55 UTCEPSS rescore
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  52. 2026-07-13 22:27 UTCEPSS rescore
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  55. 2026-07-12 05:43 UTCEPSS rescore
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  57. 2026-07-11 08:24 UTCEPSS rescore
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  59. 2026-07-09 19:06 UTCEPSS rescore
  60. 2026-07-08 15:11 UTCEPSS rescore
  61. 2026-07-07 13:43 UTCEPSS rescore
  62. 2026-07-06 16:25 UTCEPSS rescore
  63. 2026-07-06 16:25 UTCEPSS rescore
  64. 2026-07-06 02:20 UTCEPSS rescore
  65. 2026-07-05 02:27 UTCEPSS rescore
  66. 2026-07-04 06:28 UTCEPSS rescore
  67. 2026-07-01 15:03 UTCEPSS rescore
  68. 2026-07-01 15:03 UTCEPSS rescore
  69. 2026-06-30 23:20 UTCEPSS rescore
  70. 2026-06-29 14:03 UTCEPSS rescore
  71. 2026-06-28 14:04 UTCEPSS rescore
  72. 2026-06-28 04:54 UTCEPSS rescore
  73. 2026-06-28 04:54 UTCEPSS rescore
  74. 2026-06-27 03:06 UTCEPSS rescore
  75. 2026-06-25 13:47 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2019-1751?
CVE-2019-1751 is a high vulnerability published on March 28, 2019. A vulnerability in the Network Address Translation 64 (NAT64) functions of Cisco IOS Software could allow an unauthenticated, remote attacker to cause either an interface queue wedge or a device reload. The vulnerability is due to the incorrect handling of certain IPv4 packet streams that are sent…
When was CVE-2019-1751 disclosed?
CVE-2019-1751 was first published on March 28, 2019, 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-2019-1751 actively exploited?
CVE-2019-1751 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.5% probability of exploitation in the next 30 days (84th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2019-1751?
CVE-2019-1751 has a CVSS v3 base score of 8.6 (NVD).
How do I remediate CVE-2019-1751?
A fix for CVE-2019-1751 is available: update to the fixed version the vendor names in its advisory.

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