Missing TLS certificate validation for HTTPS connections in osc

published 2019-11-05 7 y ago modified 2026-06-17 4 mo ago also EUVD-2019-13320

cvss: 7.4; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.7%; EPSS 0.7% chance of exploitation in 30 days, percentile 53%
public exploits: 0; none known

Open Build Service before version 0.165.4 diddn't validate TLS certificates for HTTPS connections with the osc client binary

Patch / fix

fixed in 1 distros 2 links 1

Open Build Service Open Build Service 0.165.4

suse opensuse

osc SLE Software Development Kit 12 SP5 0.182.0-15.12.1
osc SLE Module for Development Tools 15 SP1 0.165.4-3.9.1

suse advisories SUSE-SU-2022:4351-1 SUSE-SU-2019:2067-1

osc openSUSE Tumbleweed 0.174.0-1.2
osc openSUSE Leap 15.1 0.165.4-lp151.2.6.1

opensuse advisories openSUSE-SU-2024:11133-1 openSUSE-SU-2019:1844-1

bugzilla.suse.com/show_bug.cgi?id=1142518 advisory

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2019-3685 updated 2025-11-21 cvss 5.6

osc: ails to adequately verify TLS certificates allowing for a man in the middle attack

Red Hat All currently supported Red Hat products
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.71% chance of exploitation in the next 30 days, higher than 53% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

bugzilla.suse.com https://bugzilla.suse.com/show_bug.cgi?id=1142518 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	3.1	7.4	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
NVD	3.1	7.7	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L
NVD	2.0	6.8	AV:N/AC:M/Au:N/C:P/I:P/A:P

Affected products

Open Build Service Open Build Service

Classification

Weakness

CWE-295 Improper Certificate Validation

References

bugzilla.suse.com /show_bug.cgi?id=1142518
exploit, issue-tracking, patch, vendor-advisory

Sources

CVE List CVE-2019-3685
NVD CVE-2019-3685

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary