Opensc: side-channel leaks while stripping encryption pkcs#1 padding
A vulnerability was found in OpenSC where PKCS#1 encryption padding removal is not implemented as side-channel resistant. This issue may result in the potential leak of private data.
- Published
- Jan 31, 2024
- Updated
- Jun 17, 2026
- EPSS
- 1.2% · 66th percentile
- CWE
- CWE-203
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Report tools
Action score
23
Monitor
Low priority for now.
- CVSS
- 23 / 40 · 5.9 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 1.2%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- 5.9
- CNA · redhat
- 5.6
- 0.3 point gap
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| opensc project | opensc | cpe:2.3:a:opensc_project:opensc |
| redhat | enterprise linux | cpe:2.3:o:redhat:enterprise_linux |
| redhat | enterprise linux eus | cpe:2.3:o:redhat:enterprise_linux_eus |
| redhat | enterprise linux for arm 64 | cpe:2.3:o:redhat:enterprise_linux_for_arm_64 |
| redhat | enterprise linux for arm 64 eus | cpe:2.3:o:redhat:enterprise_linux_for_arm_64_eus |
| redhat | enterprise linux for ibm z systems | cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems |
| redhat | enterprise linux for ibm z systems eus | cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems_eus |
| redhat | enterprise linux for power little endian | cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian |
| redhat | enterprise linux for power little endian eus | cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian_eus |
| redhat | enterprise linux server aus | cpe:2.3:o:redhat:enterprise_linux_server_aus |
| redhat | enterprise linux server for power little endian update services for sap solutions | cpe:2.3:o:redhat:enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- opensc project openscbefore 0.25.0
- redhat enterprise linux7.0
- redhat enterprise linux8.0
- redhat enterprise linux9.0
- redhat enterprise linux eus9.4
- redhat enterprise linux for arm 648.0_aarch64
- redhat enterprise linux for arm 649.0_aarch64
- redhat enterprise linux for arm 64 eus9.4_aarch64
- redhat enterprise linux for ibm z systems8.0_s390x
- redhat enterprise linux for ibm z systems9.0_s390x
- redhat enterprise linux for ibm z systems eus9.4_s390x
- redhat enterprise linux for power little endian9.0_ppc64le
- redhat enterprise linux for power little endian eus9.4_ppc64le
- redhat enterprise linux server aus9.4
- redhat enterprise linux server for power little endian update services for sap solutions9.2
- redhat enterprise linux server for power little endian update services for sap solutions9.4_ppc64le
Versions reported by the vendor
Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.
Red Hat Red Hat Enterprise Linux 7
- all versionsaffected
Red Hat Red Hat Enterprise Linux 8
- 0:0.20.0-8.el8_9 and laternot affected · rpm
Red Hat Red Hat Enterprise Linux 9
- 0:0.23.0-4.el9_3 and laternot affected · rpm
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| AlmaLinux:8 | opensc | before 0.20.0-8.el8_9 | 0.20.0-8.el8_9 |
| AlmaLinux:9 | opensc | before 0.23.0-4.el9_3 | 0.23.0-4.el9_3 |
| Debian:11 | opensc | before 0.21.0-1+deb11u1 | 0.21.0-1+deb11u1 |
| Debian:12 | opensc | before 0.23.0-0.3+deb12u2 | 0.23.0-0.3+deb12u2 |
| Debian:13 | opensc | before 0.25.0~rc1-1 | 0.25.0~rc1-1 |
| Red Hat:enterprise_linux:8::baseos | opensc | before 0:0.20.0-8.el8_9 | 0:0.20.0-8.el8_9 |
| Red Hat:enterprise_linux:8::baseos | opensc-debuginfo | before 0:0.20.0-8.el8_9 | 0:0.20.0-8.el8_9 |
| Red Hat:enterprise_linux:8::baseos | opensc-debugsource | before 0:0.20.0-8.el8_9 | 0:0.20.0-8.el8_9 |
| Red Hat:enterprise_linux:9::baseos | opensc | before 0:0.23.0-4.el9_3 | 0:0.23.0-4.el9_3 |
| Red Hat:enterprise_linux:9::baseos | opensc-debuginfo | before 0:0.23.0-4.el9_3 | 0:0.23.0-4.el9_3 |
| Red Hat:enterprise_linux:9::baseos | opensc-debugsource | before 0:0.23.0-4.el9_3 | 0:0.23.0-4.el9_3 |
| Rocky Linux:8 | opensc | before 0:0.20.0-8.el8_9 | 0:0.20.0-8.el8_9 |
| Rocky Linux:9 | opensc | before 0:0.23.0-4.el9_3 | 0:0.23.0-4.el9_3 |
| SUSE:Linux Enterprise Micro 5.1 | opensc | before 0.19.0-150100.3.28.1 | 0.19.0-150100.3.28.1 |
| SUSE:Linux Enterprise Micro 5.3 | opensc | before 0.22.0-150400.3.9.1 | 0.22.0-150400.3.9.1 |
| SUSE:Linux Enterprise Micro 5.3 | opensc | before 0.22.0-150400.3.9.1 | 0.22.0-150400.3.9.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP6 | opensc | before 0.22.0-150600.11.6.1 | 0.22.0-150600.11.6.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP6 | opensc | before 0.22.0-150600.11.6.1 | 0.22.0-150600.11.6.1 |
| SUSE:Linux Enterprise Server 12 SP5 | opensc | before 0.13.0-3.28.1 | 0.13.0-3.28.1 |
| SUSE:Linux Micro 6.0 | opensc | before 0.24.0-4.1 | 0.24.0-4.1 |
| SUSE:Linux Micro 6.1 | opensc | before 0.24.0-slfo.1.1_2.1 | 0.24.0-slfo.1.1_2.1 |
Same product
opensc project: all recordsOther highest-scoring records for the same primary product.
- CVE-2019-6502sc_context_create in ctx.c in libopensc in OpenSC 0.19.0 has a memory leak, as demonstrated by a call from eidenv.31Monitor
- CVE-2021-34193Stack overflow vulnerability in OpenSC smart card middleware before 0.23 via crafted responses to APDUs.30Monitor
- CVE-2019-16058An issue was discovered in the pam_p11 component 0.2.0 and 0.3.0 for OpenSC.30Monitor
- CVE-2023-2977A vulnerbility was found in OpenSC.28Monitor
- CVE-2025-66215OpenSC: Stack-buffer-overflow WRITE in card-oberthur27Monitor
- CVE-2025-66038OpenSC: `sc_compacttlv_find_tag` can return out-of-bounds pointers27Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| almalinux:opensc | 0.23.0-4.el9_3 · AlmaLinux:9 | Package registry (OSV) |
| debian:opensc | 0.23.0-0.3+deb12u2 · Debian:12 | Package registry (OSV) |
| opensuse:opensc | 0.22.0-150400.3.9.1 · openSUSE:Leap Micro 5.3 | Package registry (OSV) |
| red hat:opensc | 0:0.23.0-4.el9_3 · Red Hat:enterprise_linux:9::baseos | Package registry (OSV) |
| red hat:opensc-debuginfo | 0:0.23.0-4.el9_3 · Red Hat:enterprise_linux:9::baseos | Package registry (OSV) |
| red hat:opensc-debugsource | 0:0.23.0-4.el9_3 · Red Hat:enterprise_linux:9::baseos | Package registry (OSV) |
| rocky linux:opensc | 0:0.23.0-4.el9_3 · Rocky Linux:9 | Package registry (OSV) |
| suse:opensc | 0.22.0-150400.3.9.1 · SUSE:Linux Enterprise Micro 5.3 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- Special conditions such as timing or configuration are required.
If successful
- Confidentiality
- high · data can be read
- Integrity
- none
- Availability
- none
- Attack vector
- Network
- Attack complexity
- High
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- None
- Availability impact
- None
Weakness class (CWE)
CWE-203 · Observable DiscrepancyCVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
ATT&CK techniques
—
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- access.redhat.com/errata/RHSA-2024:0966
- access.redhat.com/errata/RHSA-2024:0967
- access.redhat.com/security/cve/CVE-2023-5992
- bugzilla.redhat.com/show_bug.cgi?id=2248685
- github.com/OpenSC/OpenSC/wiki/CVE-2023-5992
- lists.debian.org/debian-lts-announce/2024/12/msg00026.html
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OWIZ5ZLO5ECYPLSTESCF7I7PQO5X6ZSU/
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RJI2FWLY24EOPALQ43YPQEZMEP3APPPI/
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UECKC7X4IM4YZQ5KRQMNBNKNOXLZC7RZ/
Vendor advisories and official records. Exploit/PoC links are deliberately left out.