CVE-2016-5696
A public proof of concept exists; no exploitation attested.
- Published2016-08-06
- WeaknessCWE-200
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
net/ipv4/tcp_input.c in the Linux kernel before 4.7 does not properly determine the rate of challenge ACK segments, which makes it easier for remote attackers to hijack TCP sessions via a blind in-window attack.
Timeline
dates in UTC- 2016-08-0620:59CVE 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-2016-5696?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2016-5696?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 |
|---|---|---|---|
| 3.3 | = 3.3 | no fix published | NVD |
| 3.4 | = 3.4 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 7.0 | ≤ 7.0 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 4.6 | ≤ 4.6.6 | no fix published | NVD |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Fix
Advisories and patches
- git.kernel.orgPatch
- www.oracle.comVendor Advisory
- github.comPatch
Detection
read 2026-10-23 19:23 UTC- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- 5 repositories, unverifiedGnoxter/mountain_goatviolentshell/roverjduck/challackbplinux/chackdunkaktus/grill PoC-in-GitHub
Sources
- NVDCVSS 3.04.8read 2026-10-23
- NVDCVSS 2.05.8read 2026-10-23
- NVDweakness (CWE)CWE-200read 2026-10-23
- FIRST EPSSEPSS score14.5 %read 2026-10-23
- PoC-in-GitHubproof of concept5read 2026-10-23
Technical details
- CVSS v3 Vector
- CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L
- Published
- 2016-08-06
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2016-5696?
Is CVE-2016-5696 actively exploited?
What is the CVSS score for CVE-2016-5696?
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