CVE-2021-42778
A heap double free issue was found in Opensc before version 0.22.0 in sc_pkcs15_free_tokeninfo.
A heap double free issue was found in Opensc before version 0.22.0 in sc_pkcs15_free_tokeninfo.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- Low
Exploit likelihood
What each source reports
NVD Score used
A heap double free issue was found in Opensc before version 0.22.0 in sc_pkcs15_free_tokeninfo.
- Record
CVE-2021-42778- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:N/I:N/A:P - Weakness
- CWE-672, CWE-415
- Updated
- 2026-11-02
CVE List No score
A heap double free issue was found in Opensc before version 0.22.0 in sc_pkcs15_free_tokeninfo.
- Record
CVE-2021-42778- Weakness
- CWE-672
- Updated
- 2026-11-02
EUVDEUVD-2021-29734 No score
A heap double free issue was found in Opensc before version 0.22.0 in sc_pkcs15_free_tokeninfo.
- Record
EUVD-2021-29734- Updated
- 2026-11-02
GitHub AdvisoriesGHSA-rh37-88v6-qm47
A heap double free issue was found in Opensc before version 0.22.0 in sc_pkcs15_free_tokeninfo.
A heap double free issue was found in Opensc before version 0.22.0 in sc_pkcs15_free_tokeninfo.
- Record
GHSA-rh37-88v6-qm47- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - Weakness
- CWE-415, CWE-672
- Updated
- 2026-11-02
OSVAZL-9481
CVE-2021-42778 affecting package opensc for versions less than 0.22.0-1
A heap double free issue was found in Opensc before version 0.22.0 in sc_pkcs15_free_tokeninfo.
- Record
AZL-9481- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - Updated
- 2026-11-02
OSV
A heap double free issue was found in Opensc before version 0.22.0 in sc_pkcs15_free_tokeninfo.
- Record
CVE-2021-42778- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - Updated
- 2026-11-02
OSVDEBIAN-CVE-2021-42778
A heap double free issue was found in Opensc before version 0.22.0 in sc_pkcs15_free_tokeninfo.
- Record
DEBIAN-CVE-2021-42778- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - Updated
- 2026-11-02
OSVOESA-2022-1664
opensc security update
OpenSC provides a set of libraries and utilities to work with smart cards. Its main focus is on cards that support cryptographic operations, and facilitate their use in security applications such as authentication, mail encryption and digital signatures. OpenSC implements the standard APIs to smart cards, e.g. PKCS#11 API, Windows’ Smart Card Minidriver and macOS Tokend.
Security Fix(es):
A heap double free issue was found in Opensc before version 0.22.0 in sc_pkcs15_free_tokeninfo.(CVE-2021-42778)
A use after return issue was found in Opensc before version 0.22.0 in insert_pin function that could potentially crash programs using the library.(CVE-2021-42780)
Stack buffer overflow issues were found in Opensc before version 0.22.0 in various places that could potentially crash programs using the library.(CVE-2021-42782)
- Record
OESA-2022-1664- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
openscAzure Linux:2 |
before 0.22.0-1 | 0.22.0-1 |
openscDebian:12 |
before 0.22.0-1 | 0.22.0-1 |
openscDebian:13 |
before 0.22.0-1 | 0.22.0-1 |
openscDebian:14 |
before 0.22.0-1 | 0.22.0-1 |
openscDebian:11 From an advisory covering 18 CVEs |
before 0.21.0-1+deb11u1, plus listed versions 0.21.0-1 |
0.21.0-1+deb11u1 |
openscopenEuler:22.03-LTS From an advisory covering 3 CVEs |
before 0.21.0-6.oe2203 | 0.21.0-6.oe2203 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, facts | ||
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-42778 is a medium vulnerability (CVSS 5.3) in Opensc, published April 18, 2022. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.14%, the 82nd percentile. Fixed in opensc 0.22.0-1.