CVE-2018-0151

CRITICALNVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score elevated to 9.8 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 9.8 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
9.8
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 14%CVSS: 9.8Exploit: NoneExposed: 0

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

A vulnerability in the quality of service (QoS) subsystem of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition or execute arbitrary code with elevated privileges. The vulnerability is due to incorrect bounds checking of certain values in packets that are destined for UDP port 18999 of an affected device. An attacker could exploit this vulnerability by sending malicious packets to an affected device. When the packets are processed, an exploitable buffer overflow condition may occur. A successful exploit could allow the attacker to execute arbitrary code on the affected device with elevated privileges. The attacker could also leverage this vulnerability to cause the device to reload, causing a temporary DoS condition while the device is reloading. The malicious packets must be destined to and processed by an affected device. Traffic transiting a device will not trigger the vulnerability. Cisco Bug IDs: CSCvf73881.

CVSS v3
9.8
EG Score
9.8(high)
EPSS
96.1%
KEV
⚠ Exploited

Published

March 28, 2018

Last Modified

January 13, 2026

Advisory Details (4)

Auto-updated Jun 1, 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-2018-0151
generic

Cisco IOS and IOS XE Software Quality of Service Remote Code Execution Vulnerability

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-qos
generic
http://www.securitytracker.com/id/1040582
generic
http://www.securityfocus.com/bid/103540

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 91× in last 7d / 394× 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 502 total refreshes for this CVE.

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

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Frequently asked(6)

What is CVE-2018-0151?
CVE-2018-0151 is a critical vulnerability published on March 28, 2018. A vulnerability in the quality of service (QoS) subsystem of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition or execute arbitrary code with elevated privileges. The vulnerability is due to incorrect bounds…
When was CVE-2018-0151 disclosed?
CVE-2018-0151 was first published in the National Vulnerability Database on March 28, 2018, with the most recent update on January 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2018-0151 actively exploited?
Yes. CISA added CVE-2018-0151 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-2018-0151?
CVE-2018-0151 has a CVSS v3 base score of 9.8 (NVD).
Which products are affected by CVE-2018-0151?
CVE-2018-0151 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-2018-0151?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-0151, 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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