CVE-2018-16855

HIGHNVD 7.58.3▲
EchelonGraph scoreHIGH confidence

Score elevated to 8.3 because EPSS predicts 59% probability of exploitation within the next 30 days (top 1.0% of all CVEs). NVD baseline CVSS 7.5 retained for reference. Confidence: see factors.

Triggered by: EPSS exploit prediction ≥85%
Sources: epss, ghsa, nvd
Elevated
8.3EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 59%
CISA-KEV: Not listedEPSS PROB: 59%CVSS: 7.5Exploit: Elevated riskExposed: 0

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

An issue has been found in PowerDNS Recursor before version 4.1.8 where a remote attacker sending a DNS query can trigger an out-of-bounds memory read while computing the hash of the query for a packet cache lookup, possibly leading to a crash.

CVSS v3
7.5
EG Score
8.3(high)
EG Risk
66(Track)
EG Risk 66/100SSVC: Track

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
Severity83% × 45%
Exploitation59% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
59%
EPSS %ILE
99%
KEV
Not listed

Published

December 3, 2018

Last Modified

November 21, 2024

References (4)

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
pdns-recursor—4.1.8-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
pdns-recursor—4.1.8-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
pdns-recursor—4.1.8-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
pdns-recursor—4.1.8-1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 5× in last 7d / 23× 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 123 total refreshes for this CVE.

  1. 2026-09-24 13:59 UTCEPSS rescore
  2. 2026-09-23 13:42 UTCEPSS rescore
  3. 2026-09-21 20:27 UTCEPSS rescore
  4. 2026-09-19 15:36 UTCEPSS rescore
  5. 2026-09-18 19:22 UTCEPSS rescore
  6. 2026-09-17 19:22 UTCEPSS rescore
  7. 2026-09-16 14:03 UTCEPSS rescore
  8. 2026-09-16 05:06 UTCEPSS rescore
  9. 2026-09-15 03:05 UTCEPSS rescore
  10. 2026-09-12 14:56 UTCEPSS rescore
  11. 2026-09-11 14:47 UTCEPSS rescore
  12. 2026-09-10 09:27 UTCEPSS rescore
  13. 2026-09-08 21:04 UTCOSV refresh
  14. 2026-09-06 13:43 UTCEPSS rescore
  15. 2026-09-05 15:24 UTCEPSS rescore
  16. 2026-09-04 13:56 UTCEPSS rescore
  17. 2026-09-02 14:07 UTCEPSS rescore
  18. 2026-09-02 14:07 UTCEPSS rescore
  19. 2026-09-01 13:49 UTCEPSS rescore
  20. 2026-08-30 19:13 UTCEPSS rescore
  21. 2026-08-28 21:36 UTCEPSS rescore
  22. 2026-08-27 14:21 UTCEPSS rescore
  23. 2026-08-26 14:41 UTCEPSS rescore
  24. 2026-08-25 13:44 UTCEPSS rescore
  25. 2026-08-22 06:07 UTCOSV refresh
Show 75 more
  1. 2026-08-21 23:44 UTCEPSS rescore
  2. 2026-08-20 22:51 UTCEPSS rescore
  3. 2026-08-19 17:00 UTCEPSS rescore
  4. 2026-08-18 13:43 UTCEPSS rescore
  5. 2026-08-17 13:42 UTCEPSS rescore
  6. 2026-08-16 14:51 UTCEPSS rescore
  7. 2026-08-16 02:10 UTCEPSS rescore
  8. 2026-08-15 01:26 UTCEPSS rescore
  9. 2026-08-13 21:56 UTCEPSS rescore
  10. 2026-08-12 13:46 UTCEPSS rescore
  11. 2026-08-11 13:36 UTCEPSS rescore
  12. 2026-08-07 16:22 UTCEPSS rescore
  13. 2026-08-06 13:42 UTCEPSS rescore
  14. 2026-08-06 13:42 UTCEPSS rescore
  15. 2026-08-06 09:10 UTCOSV refresh
  16. 2026-08-04 15:05 UTCEPSS rescore
  17. 2026-07-30 16:24 UTCEPSS rescore
  18. 2026-07-30 01:27 UTCEPSS rescore
  19. 2026-07-28 15:32 UTCEPSS rescore
  20. 2026-07-26 14:51 UTCEPSS rescore
  21. 2026-07-26 14:51 UTCEPSS rescore
  22. 2026-07-24 14:14 UTCEPSS rescore
  23. 2026-07-23 14:15 UTCEPSS rescore
  24. 2026-07-23 14:15 UTCEPSS rescore
  25. 2026-07-23 01:34 UTCEG score recompute▲ 0.80
  26. 2026-07-22 22:14 UTCEG score recompute
  27. 2026-07-22 14:04 UTCEPSS rescore
  28. 2026-07-21 02:17 UTCOSV refresh
  29. 2026-07-20 17:04 UTCEPSS rescore
  30. 2026-07-20 17:04 UTCEPSS rescore
  31. 2026-07-19 14:28 UTCEPSS rescore
  32. 2026-07-19 02:26 UTCEPSS rescore
  33. 2026-07-19 02:26 UTCEPSS rescore
  34. 2026-07-16 16:59 UTCEPSS rescore
  35. 2026-07-16 16:59 UTCEPSS rescore
  36. 2026-07-15 16:55 UTCEPSS rescore
  37. 2026-07-13 22:26 UTCEPSS rescore
  38. 2026-07-13 06:10 UTCEPSS rescore
  39. 2026-07-12 05:43 UTCEPSS rescore
  40. 2026-07-11 08:24 UTCEPSS rescore
  41. 2026-07-09 19:06 UTCEPSS rescore
  42. 2026-07-07 13:42 UTCEPSS rescore
  43. 2026-07-07 13:42 UTCEPSS rescore
  44. 2026-07-06 02:20 UTCEPSS rescore
  45. 2026-07-03 21:26 UTCOSV refresh
  46. 2026-07-02 16:54 UTCEPSS rescore
  47. 2026-07-01 15:03 UTCEPSS rescore
  48. 2026-07-01 15:03 UTCEPSS rescore
  49. 2026-06-30 23:19 UTCEPSS rescore
  50. 2026-06-30 23:19 UTCEPSS rescore
  51. 2026-06-28 04:53 UTCEPSS rescore
  52. 2026-06-28 04:53 UTCEPSS rescore
  53. 2026-06-27 03:06 UTCEPSS rescore
  54. 2026-06-25 13:47 UTCEPSS rescore
  55. 2026-06-25 13:47 UTCEPSS rescore
  56. 2026-06-24 14:02 UTCEPSS rescore
  57. 2026-06-24 14:02 UTCEPSS rescore
  58. 2026-06-23 21:30 UTCEPSS rescore
  59. 2026-06-22 14:23 UTCEPSS rescore
  60. 2026-06-21 01:57 UTCEPSS rescore
  61. 2026-06-21 01:57 UTCEPSS rescore
  62. 2026-06-18 17:50 UTCEPSS rescore
  63. 2026-06-18 17:50 UTCEPSS rescore
  64. 2026-06-17 17:50 UTCEPSS rescore
  65. 2026-06-17 17:50 UTCEPSS rescore
  66. 2026-06-16 17:50 UTCEPSS rescore
  67. 2026-06-16 17:50 UTCEPSS rescore
  68. 2026-06-15 17:45 UTCEPSS rescore
  69. 2026-06-15 09:43 UTCOSV refresh
  70. 2026-06-14 23:14 UTCEPSS rescore
  71. 2026-06-14 23:14 UTCEPSS rescore
  72. 2026-06-13 22:58 UTCEPSS rescore
  73. 2026-06-13 22:58 UTCEPSS rescore
  74. 2026-06-12 23:09 UTCEPSS rescore
  75. 2026-06-11 13:57 UTCEPSS rescore

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2018-16855?
CVE-2018-16855 is a high vulnerability published on December 3, 2018. An issue has been found in PowerDNS Recursor before version 4.1.8 where a remote attacker sending a DNS query can trigger an out-of-bounds memory read while computing the hash of the query for a packet cache lookup, possibly leading to a crash.
When was CVE-2018-16855 disclosed?
CVE-2018-16855 was first published in the National Vulnerability Database on December 3, 2018, 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-2018-16855 actively exploited?
CVE-2018-16855 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 59% probability of exploitation in the next 30 days, which ranks it in the top 0.9% of all scored CVEs.
What is the CVSS score of CVE-2018-16855?
CVE-2018-16855 has a CVSS v3 base score of 7.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 8.3.
How do I remediate CVE-2018-16855?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-16855, 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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