The tlslite library before 0.4.9 for Python allows remote attackers to trigger a denial of service (runtime exception and process crash).
CVE-2015-3220
HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence
This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.8%, top 26% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: epss, nvd
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 3%CVSS: 7.5Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 7.5
- EG Score
- 7.5(medium)
- EPSS
- 86.6%
- KEV
- Not listed
Published
June 13, 2017
Last Modified
May 13, 2026
References (6)
- secalert@redhathttps://bugzilla.redhat.com/show_bug.cgi?id=1254215
- secalert@redhathttps://github.com/trevp/tlslite/commit/aca8d4f898b436ff6754e1a9ab96cae976c8a853
- secalert@redhathttps://groups.google.com/forum/#%21topic/tlslite-dev/MoWE7B0A4iU
- af854a3a-2127-422b-91ae-364da2661108https://bugzilla.redhat.com/show_bug.cgi?id=1254215
- af854a3a-2127-422b-91ae-364da2661108https://github.com/trevp/tlslite/commit/aca8d4f898b436ff6754e1a9ab96cae976c8a853
- af854a3a-2127-422b-91ae-364da2661108https://groups.google.com/forum/#%21topic/tlslite-dev/MoWE7B0A4iU
Frequently asked(5)
What is CVE-2015-3220?
CVE-2015-3220 is a high vulnerability published on June 13, 2017. The tlslite library before 0.4.9 for Python allows remote attackers to trigger a denial of service (runtime exception and process crash).
When was CVE-2015-3220 disclosed?
CVE-2015-3220 was first published in the National Vulnerability Database on June 13, 2017, with the most recent update on May 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2015-3220 actively exploited?
CVE-2015-3220 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 86.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2015-3220?
CVE-2015-3220 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2015-3220?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2015-3220, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2015-3220
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