CVE-2025-13763: opensc Use of Uninitialized Variable
CVSS: 5.7v3.1MediumAwaiting analysis
AliasesUBUNTU-CVE-2025-13763DEBIAN-CVE-2025-13763
Published 23-04-2026Last modified 30-06-2026
Vulnerability summary
CVE-2025-13763 is a medium (CVSS 5.7) Use of Uninitialized Variable vulnerability in opensc. EPSS estimates a 0.27% chance of exploitation in the next 30 days, higher than 17.3% of scored vulnerabilities.
CVSS score
5.7/10
010
Medium · v3.1 (CVE.org)EPSS score
0.27%
0%100%
Low · +0.09 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 2 · Related 1Timeline
- 23-04-2026PublishedVulnerability first disclosed.
- 30-06-2026Last modifiedVulnerability information updated.
Description
Multiple uses of uninitialized variables were found in libopensc that may lead to information disclosure or application crash. An attack requires a crafted USB device or smart card that would present the system with specially crafted responses to the APDUs
CVSS metrics
4 scores · 4 sources · 1 versionMedium 5.7Preferred score · CVE.org (CNA)
CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:HSourcesAll 4 agree
- OSV · UbuntuEcosystem advisory · calculated5.7MediumCVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.7MediumCVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H
- NVDNIST5.7MediumCVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H
EPSS trend
Probability
0.27%
Chance of exploitation in the next 30 days
Percentile
17%
Versus all other CVEs
30-day change
+0.09 pp
From 0.18% on 19-09-2026
19-09-202619-10-2026
EPSS score0.27%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Debian1 product
- openscAll versions (No fix recorded) | < 0.27.0~rc1-1
Opensc1 product
- opensc< 0.27.0
Ubuntu1 product
- openscAll versions (No fix recorded)
3 vendors · 3 products
