CVE-2017-1000256: debian debian_linux Improper Certificate Validation
Vulnerability summary
CVE-2017-1000256 is a high (CVSS 8.1) Improper Certificate Validation vulnerability in debian debian_linux. EPSS estimates a 1.71% chance of exploitation in the next 30 days, higher than 77.4% of scored vulnerabilities.
Severe, CVSS 8.1 (NVD); no exploitation reported by the 5 checked sources; EPSS 2% (FIRST, 03-11-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 2 · Related 1Timeline
- 31-10-2017PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
Description
libvirt version 2.3.0 and later is vulnerable to a bad default configuration of "verify-peer=no" passed to QEMU by libvirt resulting in a failure to validate SSL/TLS certificates by default.
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · AlpineEcosystem advisory · calculated8.1HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated8.1HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
1.71%
Chance of exploitation in the next 30 days
Percentile
77%
Versus all other CVEs
30-day change
No change 0.00 pp
From 1.71% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Suse4 products
- libvirt&distro=SUSE Linux Enterprise Desktop 12 SP3< 3.3.0-5.8.1
- libvirt&distro=SUSE Linux Enterprise Server 12 SP3< 3.3.0-5.8.1
- libvirt&distro=SUSE Linux Enterprise Server for SAP Applications 12 SP3< 3.3.0-5.8.1
- libvirt&distro=SUSE Linux Enterprise Software Development Kit 12 SP3< 3.3.0-5.8.1
Debian2 products
- libvirt< 3.8.0-3 | < 3.0.0-4+deb9u1
- debian_linuxEOL9.0
Alpine1 product
- libvirt≥ 2.3.0, < 2.5.0-r2 | ≥ 2.3.0, < 3.3.0-r2
Redhat1 product
- libvirt≥ 2.3.0, < 3.9.0
4 vendors · 8 products
References
11 links- www.redhat.com/archives/libvirt-announce/2017-October/msg00001.htmlMailing ListX Refsource MLISTIssue TrackingVendor Advisory
