CVE-2018-5740
A public proof of concept exists; no exploitation attested.
- Published2019-01-16
- Fixed in9.13.2 · 9.12.2 · 9.11.4 · 9.10.8 · 9.9.13 · 9.8.8
- WeaknessCWE-617
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
"deny-answer-aliases" is a little-used feature intended to help recursive server operators protect end users against DNS rebinding attacks, a potential method of circumventing the security model used by client browsers. However, a defect in this feature makes it easy, when the feature is in use, to experience an assertion failure in name.c. Affects BIND 9.7.0->9.8.8, 9.9.0->9.9.13, 9.10.0->9.10.8, 9.11.0->9.11.4, 9.12.0->9.12.2, 9.13.0->9.13.2.
Timeline
dates in UTC- 2019-01-1620:29CVE publishedNVD
- 2026-10-2319:23First public proof of conceptPoC-in-GitHub
- 2026-10-2319:23EPSS crossed 10 %FIRST EPSS
Observed activity
isMalicious corpus · updated 2026-10-23 18:48 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2018-5740?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2018-5740?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 9.13 | ≥ 9.13.0, < 9.13.2 | 9.13.2 | NVD |
| 9.12 | ≥ 9.12.0, < 9.12.2 | 9.12.2 | NVD |
| 9.11 | ≥ 9.11.0, < 9.11.4 | 9.11.4 | NVD |
| 9.10 | ≥ 9.10.0, < 9.10.8 | 9.10.8 | NVD |
| 9.9 | ≥ 9.9.0, < 9.9.13 | 9.9.13 | NVD |
| 9.x | ≥ 9.7.0, < 9.8.8 | 9.8.8 | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 12.4 | = 12.04 | no fix published | NVD |
| 14.4 | = 14.04 | no fix published | NVD |
| 16.4 | = 16.04 | no fix published | NVD |
| 18.4 | = 18.04 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 15.0 | = 15.0 | no fix published | NVD |
| 15.1 | = 15.1 | no fix published | NVD |
| 42.3 | = 42.3 | no fix published | NVD |
8 more products in the sources.
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Fix
- Update Isc bind to 9.13.2 · 9.12.2 · 9.11.4 · 9.10.8 · 9.9.13 · 9.8.8
Advisories and patches
- kb.isc.orgVendor Advisory
Detection
read 2026-10-23 19:23 UTC- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
Sources
- NVDCVSS 3.17.5read 2026-10-23
- CNACVSS 3.07.5read 2026-10-23
- NVDCVSS 2.05read 2026-10-23
- NVDweakness (CWE)CWE-617read 2026-10-23
- FIRST EPSSEPSS score59.6 %read 2026-10-23
- PoC-in-GitHubproof of concept1read 2026-10-23
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Published
- 2019-01-16
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2018-5740?
Is CVE-2018-5740 actively exploited?
What is the CVSS score for CVE-2018-5740?
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.