CVE-2018-20251

MEDIUMNVD 5.55.6▲
EchelonGraph scoreHIGH confidence

Score elevated to 5.6 because EPSS predicts 32% probability of exploitation within the next 30 days (98th percentile of EPSS-scored CVEs). NVD baseline CVSS 5.5 retained for reference. Confidence: see factors.

Triggered by: EPSS exploit prediction (continuous uplift above 30%)
Sources: epss, ghsa, nvd
Elevated
5.6EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 31%CVSS: 5.5Exploit: Elevated riskExposed services: Not assessed

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

In WinRAR versions prior to and including 5.61, there is path traversal vulnerability when crafting the filename field of the ACE format. The UNACE module (UNACEV2.dll) creates files and folders as written in the filename field even when WinRAR validator noticed the traversal attempt and requestd to abort the extraction process. the operation is cancelled only after the folders and files were created but prior to them being written, therefore allowing the attacker to create empty files and folders everywhere in the file system.

CVSS v3
5.5
EG Score
5.6MEDIUMhigh confidence
EG Risk
46
EG Risk 46/100CISA 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
Severity56% × 45%
Exploitation40% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track* or 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
31%
EPSS %ILE
98th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* or 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 public PoC (EG-KEV: elevated) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). 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

February 5, 2019

Last Modified

November 21, 2024

References (6)

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 22× 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 147 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 23:42 UTCEPSS rescore
  4. 2026-10-06 15:12 UTCEPSS rescore
  5. 2026-10-05 17:39 UTCEPSS rescore
  6. 2026-10-03 14:21 UTCEPSS rescore
  7. 2026-10-01 19:44 UTCEPSS rescore
  8. 2026-09-30 14:59 UTCEPSS rescore
  9. 2026-09-30 09:59 UTCEG score recompute
  10. 2026-09-28 13:45 UTCEPSS rescore
  11. 2026-09-27 13:40 UTCEPSS rescore
  12. 2026-09-26 15:53 UTCEPSS rescore
  13. 2026-09-24 13:59 UTCEPSS rescore
  14. 2026-09-24 13:59 UTCEPSS rescore
  15. 2026-09-19 15:36 UTCEPSS rescore
  16. 2026-09-18 19:22 UTCEPSS rescore
  17. 2026-09-17 19:22 UTCEPSS rescore
  18. 2026-09-16 05:06 UTCEPSS rescore
  19. 2026-09-15 03:05 UTCEPSS rescore
  20. 2026-09-12 14:56 UTCEPSS rescore
  21. 2026-09-11 14:47 UTCEPSS rescore
  22. 2026-09-11 09:32 UTCEPSS rescore
  23. 2026-09-06 13:43 UTCEPSS rescore
  24. 2026-09-05 15:24 UTCEPSS rescore
  25. 2026-09-04 13:56 UTCEPSS rescore
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  1. 2026-09-04 05:02 UTCEPSS rescore
  2. 2026-09-02 14:07 UTCEPSS rescore
  3. 2026-09-01 13:49 UTCEPSS rescore
  4. 2026-09-01 03:32 UTCEPSS rescore
  5. 2026-08-28 21:36 UTCEPSS rescore
  6. 2026-08-27 14:21 UTCEPSS rescore
  7. 2026-08-26 14:42 UTCEPSS rescore
  8. 2026-08-25 13:44 UTCEPSS rescore
  9. 2026-08-21 23:45 UTCEPSS rescore
  10. 2026-08-20 22:51 UTCEPSS rescore
  11. 2026-08-19 17:00 UTCEPSS rescore
  12. 2026-08-18 13:44 UTCEPSS rescore
  13. 2026-08-17 13:43 UTCEPSS rescore
  14. 2026-08-16 14:51 UTCEPSS rescore
  15. 2026-08-16 02:10 UTCEPSS rescore
  16. 2026-08-15 01:26 UTCEPSS rescore
  17. 2026-08-13 21:56 UTCEPSS rescore
  18. 2026-08-12 13:46 UTCEPSS rescore
  19. 2026-08-08 16:32 UTCEPSS rescore
  20. 2026-08-07 16:23 UTCEPSS rescore
  21. 2026-08-06 13:42 UTCEPSS rescore
  22. 2026-08-05 19:13 UTCEPSS rescore
  23. 2026-08-04 15:05 UTCEPSS rescore
  24. 2026-08-01 04:12 UTCEPSS rescore
  25. 2026-07-30 16:24 UTCEPSS rescore
  26. 2026-07-30 01:27 UTCEPSS rescore
  27. 2026-07-28 15:32 UTCEPSS rescore
  28. 2026-07-26 14:51 UTCEPSS rescore
  29. 2026-07-26 14:51 UTCEPSS rescore
  30. 2026-07-25 14:14 UTCEPSS rescore
  31. 2026-07-24 14:14 UTCEPSS rescore
  32. 2026-07-24 14:14 UTCEPSS rescore
  33. 2026-07-23 14:15 UTCEPSS rescore
  34. 2026-07-23 01:35 UTCEG score recompute▲ 0.10
  35. 2026-07-22 22:15 UTCEG score recompute
  36. 2026-07-22 14:05 UTCEPSS rescore
  37. 2026-07-21 15:22 UTCEPSS rescore
  38. 2026-07-20 17:04 UTCEPSS rescore
  39. 2026-07-20 17:04 UTCEPSS rescore
  40. 2026-07-19 02:26 UTCEPSS rescore
  41. 2026-07-19 02:26 UTCEPSS rescore
  42. 2026-07-16 16:59 UTCEPSS rescore
  43. 2026-07-16 16:59 UTCEPSS rescore
  44. 2026-07-15 16:55 UTCEPSS rescore
  45. 2026-07-15 16:55 UTCEPSS rescore
  46. 2026-07-15 01:56 UTCEPSS rescore
  47. 2026-07-15 01:56 UTCEPSS rescore
  48. 2026-07-13 22:27 UTCEPSS rescore
  49. 2026-07-13 22:26 UTCEPSS rescore
  50. 2026-07-13 06:10 UTCEPSS rescore
  51. 2026-07-12 05:43 UTCEPSS rescore
  52. 2026-07-11 08:24 UTCEPSS rescore
  53. 2026-07-09 19:06 UTCEPSS rescore
  54. 2026-07-08 15:11 UTCEPSS rescore
  55. 2026-07-06 16:24 UTCEPSS rescore
  56. 2026-07-06 16:24 UTCEPSS rescore
  57. 2026-07-05 02:27 UTCEPSS rescore
  58. 2026-07-02 16:54 UTCEPSS rescore
  59. 2026-07-01 15:03 UTCEPSS rescore
  60. 2026-07-01 15:03 UTCEPSS rescore
  61. 2026-06-30 23:20 UTCEPSS rescore
  62. 2026-06-30 23:19 UTCEPSS rescore
  63. 2026-06-28 04:53 UTCEPSS rescore
  64. 2026-06-28 04:53 UTCEPSS rescore
  65. 2026-06-27 03:06 UTCEPSS rescore
  66. 2026-06-27 03:06 UTCEPSS rescore
  67. 2026-06-25 13:47 UTCEPSS rescore
  68. 2026-06-25 13:47 UTCEPSS rescore
  69. 2026-06-24 14:02 UTCEPSS rescore
  70. 2026-06-24 14:02 UTCEPSS rescore
  71. 2026-06-23 21:30 UTCEPSS rescore
  72. 2026-06-23 21:30 UTCEPSS rescore
  73. 2026-06-23 21:30 UTCEPSS rescore
  74. 2026-06-22 14:23 UTCEPSS rescore
  75. 2026-06-21 14:54 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2018-20251?
CVE-2018-20251 is a medium vulnerability published on February 5, 2019. In WinRAR versions prior to and including 5.61, there is path traversal vulnerability when crafting the filename field of the ACE format. The UNACE module (UNACEV2.dll) creates files and folders as written in the filename field even when WinRAR validator noticed the traversal attempt and requestd…
When was CVE-2018-20251 disclosed?
CVE-2018-20251 was first published on February 5, 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-2018-20251 actively exploited?
CVE-2018-20251 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 31% probability of exploitation in the next 30 days (98th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2018-20251?
CVE-2018-20251 has a CVSS v3 base score of 5.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 5.6 (MEDIUM).
How do I remediate CVE-2018-20251?
No fix for CVE-2018-20251 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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