CVE-2018-20164

MEDIUMNVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under NVD CVSS v3. EPSS exploit probability: 1.0%, top 23% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
5.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 3%CVSS: 5.3Exploit: NoneExposed: 0

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

An issue was discovered in regex.yaml (aka regexes.yaml) in UA-Parser UAP-Core before 0.6.0. A Regular Expression Denial of Service (ReDoS) issue allows remote attackers to overload a server by setting the User-Agent header in an HTTP(S) request to a value containing a long digit string. (The UAP-Core project contains the vulnerability, propagating to all implementations.)

CVSS v3
5.3
EG Score
5.3(medium)
EPSS
87.1%
KEV
Not listed

Published

February 13, 2019

Last Modified

November 21, 2024

References (8)

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFixed inDependents
uap-core—0.6.0—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 50× 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. 2026-07-11 08:24 UTCEPSS rescore
  2. 2026-07-09 19:06 UTCEPSS rescore
  3. 2026-07-08 15:11 UTCEPSS rescore
  4. 2026-07-07 13:42 UTCEPSS rescore
  5. 2026-07-07 13:42 UTCEPSS rescore
  6. 2026-07-06 16:24 UTCEPSS rescore
  7. 2026-07-06 16:24 UTCEPSS rescore
  8. 2026-07-06 02:20 UTCEPSS rescore
  9. 2026-07-05 02:27 UTCEPSS rescore
  10. 2026-07-04 06:28 UTCEPSS rescore
  11. 2026-07-04 06:28 UTCEPSS rescore
  12. 2026-07-03 17:56 UTCOSV refresh
  13. 2026-07-02 16:54 UTCEPSS rescore
  14. 2026-07-01 15:03 UTCEPSS rescore
  15. 2026-07-01 15:03 UTCEPSS rescore
  16. 2026-06-30 23:20 UTCEPSS rescore
  17. 2026-06-30 23:19 UTCEPSS rescore
  18. 2026-06-29 14:03 UTCEPSS rescore
  19. 2026-06-28 14:04 UTCEPSS rescore
  20. 2026-06-28 04:53 UTCEPSS rescore
  21. 2026-06-28 04:53 UTCEPSS rescore
  22. 2026-06-27 03:06 UTCEPSS rescore
  23. 2026-06-27 03:06 UTCEPSS rescore
  24. 2026-06-25 13:47 UTCEPSS rescore
  25. 2026-06-25 13:47 UTCEPSS rescore
Show 57 more
  1. 2026-06-24 14:02 UTCEPSS rescore
  2. 2026-06-24 14:02 UTCEPSS rescore
  3. 2026-06-23 21:30 UTCEPSS rescore
  4. 2026-06-23 21:30 UTCEPSS rescore
  5. 2026-06-23 21:30 UTCEPSS rescore
  6. 2026-06-22 14:23 UTCEPSS rescore
  7. 2026-06-21 14:54 UTCEPSS rescore
  8. 2026-06-21 14:54 UTCEPSS rescore
  9. 2026-06-21 01:57 UTCEPSS rescore
  10. 2026-06-21 01:57 UTCEPSS rescore
  11. 2026-06-19 19:23 UTCEPSS rescore
  12. 2026-06-19 19:23 UTCEPSS rescore
  13. 2026-06-18 17:50 UTCEPSS rescore
  14. 2026-06-18 17:50 UTCEPSS rescore
  15. 2026-06-17 17:50 UTCEPSS rescore
  16. 2026-06-17 17:50 UTCEPSS rescore
  17. 2026-06-16 17:50 UTCEPSS rescore
  18. 2026-06-16 17:50 UTCEPSS rescore
  19. 2026-06-15 17:45 UTCEPSS rescore
  20. 2026-06-15 06:13 UTCOSV refresh
  21. 2026-06-14 23:15 UTCEPSS rescore
  22. 2026-06-14 23:14 UTCEPSS rescore
  23. 2026-06-13 22:58 UTCEPSS rescore
  24. 2026-06-12 23:09 UTCEPSS rescore
  25. 2026-06-12 23:09 UTCEPSS rescore
  26. 2026-06-11 13:57 UTCEPSS rescore
  27. 2026-06-10 22:16 UTCEPSS rescore
  28. 2026-06-10 13:19 UTCEPSS rescore
  29. 2026-06-08 14:14 UTCEPSS rescore
  30. 2026-06-08 14:14 UTCEPSS rescore
  31. 2026-06-07 15:22 UTCEPSS rescore
  32. 2026-06-07 15:22 UTCEPSS rescore
  33. 2026-06-06 13:45 UTCEPSS rescore
  34. 2026-06-06 13:45 UTCEPSS rescore
  35. 2026-06-05 22:45 UTCEPSS rescore
  36. 2026-06-05 22:45 UTCEPSS rescore
  37. 2026-06-05 06:08 UTCEPSS rescore
  38. 2026-06-05 06:08 UTCEPSS rescore
  39. 2026-06-04 13:10 UTCEPSS rescore
  40. 2026-06-02 20:11 UTCEPSS rescore
  41. 2026-06-02 20:11 UTCEPSS rescore
  42. 2026-06-01 13:50 UTCEPSS rescore
  43. 2026-06-01 13:50 UTCEPSS rescore
  44. 2026-05-31 22:29 UTCEPSS rescore
  45. 2026-05-31 00:14 UTCEPSS rescore
  46. 2026-05-31 00:14 UTCEPSS rescore
  47. 2026-05-29 13:41 UTCEPSS rescore
  48. 2026-05-28 13:42 UTCEPSS rescore
  49. 2026-05-28 13:42 UTCEPSS rescore
  50. 2026-05-27 22:32 UTCEG score recompute
  51. 2026-05-27 13:38 UTCEPSS rescore
  52. 2026-05-27 13:38 UTCEPSS rescore
  53. 2026-05-26 13:42 UTCEPSS rescore
  54. 2026-05-26 13:42 UTCEPSS rescore
  55. 2026-05-26 13:41 UTCOSV refresh
  56. 2026-05-26 07:17 UTCEPSS rescore
  57. 2026-05-26 07:17 UTCEPSS rescore

Frequently asked(5)

What is CVE-2018-20164?
CVE-2018-20164 is a medium vulnerability published on February 13, 2019. An issue was discovered in regex.yaml (aka regexes.yaml) in UA-Parser UAP-Core before 0.6.0. A Regular Expression Denial of Service (ReDoS) issue allows remote attackers to overload a server by setting the User-Agent header in an HTTP(S) request to a value containing a long digit string. (The…
When was CVE-2018-20164 disclosed?
CVE-2018-20164 was first published in the National Vulnerability Database on February 13, 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-2018-20164 actively exploited?
CVE-2018-20164 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 87.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2018-20164?
CVE-2018-20164 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2018-20164?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-20164, 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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