CVE-2017-9109

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: HIGH) published 2022-05-24. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2%CVSS: 9.8Exploit: None knownExposed: 0

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

An issue was discovered in adns before 1.5.2. It fails to ignore apparent answers before the first RR that was found the first time. when this is fixed, the second answer scan finds the same RRs at the first. Otherwise, adns can be confused by interleaving answers for the CNAME target, with the CNAME itself. In that case the answer data structure (on the heap) can be overrun. With this fixed, it prefers to look only at the answer RRs which come after the CNAME, which is at least arguably correct.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity98% × 45%
Exploitation2% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
2%
EPSS %ILE
80%
KEV
Not listed

Published

June 18, 2020

Last Modified

November 21, 2024

Advisory Details (4)

Auto-updated Aug 13, 2026
No patch confirmed yet.
generic

[SECURITY] Fedora 32 Update: adns-1.6.0-1.fc32 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TRVHN3GGVNQWAOL3PWC5FLAV7HUESLZR/
generic

[SECURITY] Fedora 31 Update: adns-1.6.0-1.fc31 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UGFZ4SPV6KFQK6ZNUZFB5Y32OYFOM5YJ/
generic

chiark - git - ianmdlvl - adns.git/summary

http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=adns.git
generic

adns 1.5.2, adns 1.6.0 - SECURITY FIXES

https://www.chiark.greenend.org.uk/pipermail/adns-announce/2020/000004.html

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
adns—1.6.0-2—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
adns—1.6.0-2—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
adns—1.6.0-2—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
adns—1.6.0-2—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 25× 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 121 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2017-9109?
CVE-2017-9109 is a critical vulnerability published on June 18, 2020. An issue was discovered in adns before 1.5.2. It fails to ignore apparent answers before the first RR that was found the first time. when this is fixed, the second answer scan finds the same RRs at the first. Otherwise, adns can be confused by interleaving answers for the CNAME target, with the…
When was CVE-2017-9109 disclosed?
CVE-2017-9109 was first published in the National Vulnerability Database on June 18, 2020, 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-2017-9109 actively exploited?
CVE-2017-9109 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2% probability of exploitation in the next 30 days, which ranks it in the top 20.3% of all scored CVEs.
What is the CVSS score of CVE-2017-9109?
CVE-2017-9109 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2017-9109?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2017-9109, 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.

Dependency Blast Radius

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