CVE-2018-15397

MEDIUMNVD 6.86.8—
EchelonGraph scoreMEDIUM confidence

Score 6.8 from GitHub Security Advisory (severity: HIGH) published 2022-05-13. NVD baseline CVSS 6.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
6.8
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 1%CVSS: 6.8Exploit: NoneExposed: 0

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

A vulnerability in the implementation of Traffic Flow Confidentiality (TFC) over IPsec functionality in Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause an affected device to restart unexpectedly, resulting in a denial of service (DoS) condition. The vulnerability is due to an error that may occur if the affected software renegotiates the encryption key for an IPsec tunnel when certain TFC traffic is in flight. An attacker could exploit this vulnerability by sending a malicious stream of TFC traffic through an established IPsec tunnel on an affected device. A successful exploit could allow the attacker to cause a daemon process on the affected device to crash, which could cause the device to crash and result in a DoS condition.

CVSS v3
6.8
EG Score
6.8(medium)
EPSS
64.8%
KEV
Not listed

Published

October 5, 2018

Last Modified

November 26, 2024

References (4)

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 38× 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.

  1. 2026-07-22 14:04 UTCEPSS rescore
  2. 2026-07-21 15:21 UTCEPSS rescore
  3. 2026-07-20 17:04 UTCEPSS rescore
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  10. 2026-07-15 16:55 UTCEPSS rescore
  11. 2026-07-15 01:56 UTCEPSS rescore
  12. 2026-07-13 22:26 UTCEPSS rescore
  13. 2026-07-12 05:43 UTCEPSS rescore
  14. 2026-07-11 08:24 UTCEPSS rescore
  15. 2026-07-09 19:06 UTCEPSS rescore
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  17. 2026-07-07 13:42 UTCEPSS rescore
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  19. 2026-07-06 16:24 UTCEPSS rescore
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  24. 2026-07-02 16:54 UTCEPSS rescore
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  1. 2026-07-01 15:03 UTCEPSS rescore
  2. 2026-06-30 23:19 UTCEPSS rescore
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  4. 2026-06-29 14:03 UTCEPSS rescore
  5. 2026-06-28 14:04 UTCEPSS rescore
  6. 2026-06-28 04:53 UTCEPSS rescore
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  8. 2026-06-27 03:06 UTCEPSS rescore
  9. 2026-06-25 13:47 UTCEPSS rescore
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  11. 2026-06-24 14:02 UTCEPSS rescore
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  15. 2026-06-21 14:54 UTCEPSS rescore
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  17. 2026-06-21 01:57 UTCEPSS rescore
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  20. 2026-06-18 17:50 UTCEPSS rescore
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  26. 2026-06-15 17:45 UTCEPSS rescore
  27. 2026-06-14 23:14 UTCEPSS rescore
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  29. 2026-06-13 22:58 UTCEPSS rescore
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  31. 2026-06-12 23:09 UTCEPSS rescore
  32. 2026-06-11 13:57 UTCEPSS rescore
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  35. 2026-06-08 14:14 UTCEPSS rescore
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  37. 2026-06-07 15:22 UTCEPSS rescore
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  39. 2026-06-06 13:45 UTCEPSS rescore
  40. 2026-06-06 13:45 UTCEPSS rescore
  41. 2026-06-05 22:45 UTCEPSS rescore
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  43. 2026-06-05 06:08 UTCEPSS rescore
  44. 2026-06-05 06:08 UTCEPSS rescore
  45. 2026-06-04 13:10 UTCEPSS rescore
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  47. 2026-06-02 20:11 UTCEPSS rescore
  48. 2026-06-02 20:11 UTCEPSS rescore
  49. 2026-06-01 13:49 UTCEPSS rescore
  50. 2026-05-31 22:29 UTCEPSS rescore
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  52. 2026-05-31 00:14 UTCEPSS rescore
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  54. 2026-05-29 13:41 UTCEPSS rescore
  55. 2026-05-28 13:42 UTCEPSS rescore
  56. 2026-05-28 13:42 UTCEPSS rescore
  57. 2026-05-28 02:27 UTCEG score recompute
  58. 2026-05-28 02:26 UTCGHSA enrichment
  59. 2026-05-27 13:38 UTCEPSS rescore
  60. 2026-05-27 13:38 UTCEPSS rescore
  61. 2026-05-26 13:42 UTCEPSS rescore
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  63. 2026-05-26 07:17 UTCEPSS rescore
  64. 2026-05-26 07:17 UTCEPSS rescore

Frequently asked(5)

What is CVE-2018-15397?
CVE-2018-15397 is a medium vulnerability published on October 5, 2018. A vulnerability in the implementation of Traffic Flow Confidentiality (TFC) over IPsec functionality in Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause an affected device to restart…
When was CVE-2018-15397 disclosed?
CVE-2018-15397 was first published in the National Vulnerability Database on October 5, 2018, with the most recent update on November 26, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2018-15397 actively exploited?
CVE-2018-15397 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 64.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2018-15397?
CVE-2018-15397 has a CVSS v3 base score of 6.8 (NVD).
How do I remediate CVE-2018-15397?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-15397, 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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