CVE-2020-27717
No exploitation reported by the sources we read.
- Published2020-12-24
- Fixed in16.0.1 · 15.1.1 · 14.1.3.1 · 13.1.3.5
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
On BIG-IP DNS 16.0.0-16.0.0.1, 15.1.0-15.1.0.5, 14.1.0-14.1.3, 13.1.0-13.1.3.4, and 12.1.0-12.1.5.2, undisclosed series of DNS requests may cause TMM to restart and generate a core file.
Timeline
dates in UTC- 2020-12-2416:15CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-27717?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-27717?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 |
|---|---|---|---|
| 16.0 | ≥ 16.0.0, < 16.0.1 | 16.0.1 | NVD |
| 15.x | ≥ 15.0.0, < 15.1.1 | 15.1.1 | NVD |
| 14.1 | ≥ 14.1.0, < 14.1.3.1 | 14.1.3.1 | NVD |
| 13.1 | ≥ 13.1.0, < 13.1.3.5 | 13.1.3.5 | NVD |
| 12.1 | ≥ 12.1.0, ≤ 12.1.5 | no fix published | NVD |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Fix
- Update F5 big-ip domain name system to 16.0.1 · 15.1.1 · 14.1.3.1 · 13.1.3.5
Advisories and patches
- support.f5.comVendor Advisory
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
- NVDCVSS 3.17.5read 2026-10-23
- NVDCVSS 2.07.8read 2026-10-23
- FIRST EPSSEPSS score1.1 %2026-10-22
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
- 2020-12-24
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2020-27717?
Is CVE-2020-27717 actively exploited?
What is the CVSS score for CVE-2020-27717?
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Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».
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