Security readout for executives and security teams
Plain-English summary
CVE-2021-42780 is a memory lifetime bug in OpenSC's insert_pin function. The public description says it could crash programs using the OpenSC library. Available sources do not provide CVSS scoring, confirmed exploitation, or impact beyond potential crashes.
Executive priority
Treat as a routine patching item unless OpenSC supports business-critical authentication workflows. The sourced impact is program crash potential, with no cited active exploitation or severity score. Schedule remediation through normal endpoint and server maintenance windows.
Technical view
The issue is described as a use-after-return flaw in OpenSC before version 0.22.0, in insert_pin. It maps to CWE-252 in the bundle, though the description centers on memory lifetime misuse. The bundle also contains inconsistent affected-version wording, so validate against vendor advisories.
Likely exposure
Exposure is likely limited to systems with OpenSC installed and applications using its library paths involving PIN insertion. Business impact appears availability-focused based on the cited description. The bundle does not support claims of data theft, privilege escalation, or remote exploitation.
Exploitation context
CISA KEV status is false, and the provided sources do not cite active exploitation. The OSS-Fuzz reference suggests discovery through automated testing, not observed attacks. Public evidence in the bundle supports potential program crashes, not weaponized exploitation.
Researcher notes
The key uncertainty is source consistency: the description says before 0.22.0, while the affected array lists OpenSC 0.22.0. Use the OpenSC commit and distro advisories to determine exact vulnerable and fixed package states. Do not infer broader impact without vendor evidence.
Mitigation direction
- Upgrade OpenSC using your operating system or vendor security update channel.
- Prefer OpenSC 0.22.0 or vendor-patched packages, per advisory mapping.
- Review Gentoo and Debian advisories for distro-specific fixed package versions.
- Prioritize systems where OpenSC-backed authentication failure would disrupt operations.
Validation and detection
- Inventory hosts and containers with OpenSC installed.
- Confirm installed package versions against vendor advisory fixed versions.
- Identify applications linked to or depending on the OpenSC library.
- Review crash logs for OpenSC-using programs during PIN insertion workflows.
- Run normal authentication regression tests after applying updates.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-252: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-42780 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=28383CVE reference
- https://bugzilla.redhat.com/show_bug.cgi?id=2016139CVE reference
- https://github.com/OpenSC/OpenSC/commit/5df913b7CVE reference
- GLSA-202209-03CVE reference · vendor-advisory
- [debian-lts-announce] 20230621 [SECURITY] [DLA 3463-1] opensc security updateCVE reference · mailing-list
- https://lists.debian.org/debian-lts-announce/2024/12/msg00026.htmlCVE reference
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Unchecked Return Value
Unchecked Return Value represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.