CVE-2025-13763Public exploit

Data disclosure or crashes via uninitialized APDU buffers

Published Apr 23, 2026 · Updated Apr 23, 2026

Use of uninitialized memory in libopensc before 0.27.0 allows physically proximate attackers to disclose data or crash applications. Several card-detection paths trust short or inconsistent APDU lengths: esteid_select_file parses unfilled bytes as FCI, while cac_read_binary exposes a full-length object with uninitialized regions. Exploitation requires physical connection of a crafted USB device or smart card; the grounded consequences are data disclosure and application crashes.

CVSS severity5.7
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use of uninitialized memory in libopensc before 0.27.0 allows physically proximate attackers to disclose data or crash applications. Several card-detection paths trust short or inconsistent APDU lengths: esteid_select_file parses unfilled bytes as FCI, while cac_read_binary exposes a full-length object with uninitialized regions. Exploitation requires physical connection of a crafted USB device or smart card; the grounded consequences are data disclosure and application crashes.

The record

CVE
CVE-2025-13763
Published
Apr 23, 2026
Updated
Apr 23, 2026
Vendor
OpenSC Project
Product
OpenSC
Classifications
CWE-457, T1200
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <0.27.0

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

OpenSC Project · OpenSCversion=0 <0.27.0
389 Directory Server · Red Hat Enterprise Linux 10Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 7Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 9Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 8Affected versions are unavailable in this record.

Published CVSS scores

3.9OpenSC ProjectCVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
5.7Red HatCVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorphysical
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-457Use of Uninitialized Variable
T1200Hardware Additions

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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