CVE-2016-4970
No exploitation reported by the sources we read.
- Published2017-04-13
- Fixed in4.1.1 · 4.0.37
- WeaknessCWE-835
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
handler/ssl/OpenSslEngine.java in Netty 4.0.x before 4.0.37.Final and 4.1.x before 4.1.1.Final allows remote attackers to cause a denial of service (infinite loop).
Timeline
dates in UTC- 2017-04-1314:59CVE publishedNVD
- 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-2016-4970?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2016-4970?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 |
|---|---|---|---|
| 4.1 | ≥ 4.1.0, < 4.1.1 | 4.1.1 | NVD |
| 4.0 | ≥ 4.0.20, < 4.0.37 | 4.0.37 | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 3.11 | = 3.11.4 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 7.1 | = 7.1 | no fix published | NVD |
1 more product in the sources.
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Fix
- Update Netty to 4.1.1 · 4.0.37
Advisories and patches
- netty.ioRelease Notes · Vendor Advisory
- netty.ioRelease Notes · Vendor Advisory
- github.comPatch
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
- NVDweakness (CWE)CWE-835read 2026-10-23
- FIRST EPSSEPSS score11.3 %read 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
- 2017-04-13
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2016-4970?
Is CVE-2016-4970 actively exploited?
What is the CVSS score for CVE-2016-4970?
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.