CVE-2017-3731
No exploitation reported by the sources we read.
- Published2017-05-04
- WeaknessCWE-125
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
If an SSL/TLS server or client is running on a 32-bit host, and a specific cipher is being used, then a truncated packet can cause that server or client to perform an out-of-bounds read, usually resulting in a crash. For OpenSSL 1.1.0, the crash can be triggered when using CHACHA20/POLY1305; users should upgrade to 1.1.0d. For Openssl 1.0.2, the crash can be triggered when using RC4-MD5; users who have not disabled that algorithm should update to 1.0.2k.
Timeline
dates in UTC- 2017-05-0419:29CVE 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-2017-3731?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2017-3731?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 |
|---|---|---|---|
| 1.1 | = 1.1.0a | no fix published | NVD |
| 1.1 | = 1.1.0b | no fix published | NVD |
| 1.1 | = 1.1.0c | no fix published | NVD |
| 1.0 | = 1.0.2 | no fix published | NVD |
| 1.0 | = 1.0.2a | no fix published | NVD |
| 1.0 | = 1.0.2b | no fix published | NVD |
| 1.0 | = 1.0.2c | no fix published | NVD |
| 1.0 | = 1.0.2d | no fix published | NVD |
| 1.0 | = 1.0.2e | no fix published | NVD |
| 1.0 | = 1.0.2f | no fix published | NVD |
| 1.0 | = 1.0.2h | no fix published | NVD |
| 1.0 | = 1.0.2i | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 7.x | ≥ 7.0.0, < 7.5.0 | 7.5.0 | NVD |
| 6.9 | ≥ 6.9.0, < 6.9.5 | 6.9.5 | NVD |
| 4.x | ≥ 4.2.0, < 4.7.3 | 4.7.3 | NVD |
| 4.x | ≥ 4.0.0, ≤ 4.1.2 | no fix published | NVD |
| 5.x | ≥ 5.0.0, ≤ 5.12.0 | no fix published | NVD |
| 6.x | ≥ 6.0.0, ≤ 6.8.1 | 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
- www.oracle.comPatch
- www.oracle.comPatch
- www.oracle.comPatch
- www.openssl.orgVendor Advisory
- www.oracle.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 2.05read 2026-10-23
- NVDweakness (CWE)CWE-125read 2026-10-23
- FIRST EPSSEPSS score57.3 %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
- 2017-05-04
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2017-3731?
Is CVE-2017-3731 actively exploited?
What is the CVSS score for CVE-2017-3731?
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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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