CVE-2023-4535 — An out-of-bounds read vulnerability was found in OpenSC packages within the MyEI

An out-of-bounds read vulnerability was found in OpenSC packages within the MyEID driver when handling symmetric key encryption. Exploiting this flaw requires an attacker to have physical access to the computer and a specially crafted USB device or smart card. This flaw allows th

01What is this vulnerability?

An out-of-bounds read vulnerability was found in OpenSC packages within the MyEID driver when handling symmetric key encryption. Exploiting this flaw requires an attacker to have physical access to the computer and a specially crafted USB device or smart card. This flaw allows the attacker to manipulate APDU responses and potentially gain unauthorized access to sensitive data, compromising the…

02Affected products

Vendor	Product	Versions
Red Hat	Red Hat Enterprise Linux 9	0:0.23.0-3.el9_3
Red Hat	Red Hat Enterprise Linux 7	unspecified
Red Hat	Red Hat Enterprise Linux 8	unspecified

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2023-11-06T16:57:45.785Z
• Last modified: 2025-11-21T06:36:21.112Z

09References

• access.redhat.com — https://access.redhat.com/errata/RHSA-2023:7879
• access.redhat.com — https://access.redhat.com/security/cve/CVE-2023-4535
• bugzilla.redhat.com — https://bugzilla.redhat.com/show_bug.cgi?id=2240914
• github.com — https://github.com/OpenSC/OpenSC/commit/f1993dc4e0b33050b8f72a3558ee88b24c4063b2
• github.com — https://github.com/OpenSC/OpenSC/issues/2792#issuecomment-1674806651
• github.com — https://github.com/OpenSC/OpenSC/releases/tag/0.24.0-rc1
• github.com — https://github.com/OpenSC/OpenSC/wiki/OpenSC-security-advisories