Security readout for executives and security teams
Plain-English summary
This vulnerability can crash lrzip/Irzip 0.631 when it processes a specially crafted compressed file. The known impact is denial of service, not data theft or code execution. Business urgency depends on whether systems automatically process untrusted compressed files.
Executive priority
Treat as a targeted availability risk. Prioritize remediation on servers or pipelines that automatically process untrusted archives; otherwise handle through normal patch management.
Technical view
The CVE describes a null pointer dereference in ucompthread in stream.c in lrzip/Irzip 0.631. A crafted compressed file can trigger a crash, causing denial of service. The source bundle provides no CVSS score, CWE, detailed affected CPEs, or fixed upstream version.
Likely exposure
Exposure is most likely where lrzip/Irzip 0.631 is installed and used to process externally supplied compressed files, especially in automated ingestion, email attachment, archive scanning, or batch extraction workflows.
Exploitation context
The source bundle does not indicate active exploitation, and KEV status is false. Public references include a GitHub issue and a Debian LTS security update, but no source in the bundle supports claims of real-world exploitation.
Researcher notes
Evidence is limited. The bundle names a null pointer dereference in ucompthread/stream.c and references a GitHub issue plus Debian LTS advisory. It does not provide exploit status, CVSS, CWE, CPE mapping, or complete remediation details.
Mitigation direction
- Inventory systems using lrzip or Irzip 0.631.
- Apply available vendor or distribution security updates, including relevant Debian LTS updates.
- Avoid processing untrusted compressed files with affected versions.
- Run archive processing with least privilege and resource isolation.
- Check upstream and distribution guidance for fixed package versions.
Validation and detection
- Confirm installed lrzip or Irzip package versions.
- Review package changelogs for CVE-2021-27345 coverage.
- Identify workflows that process untrusted compressed files.
- Check crash logs for failures during lrzip archive handling.
- Verify Debian DLA 2981-1 or equivalent updates are applied where relevant.
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.
CVE-2021-27345 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://github.com/ckolivas/lrzip/issues/164CVE reference · x_refsource_MISC
- [debian-lts-announce] 20220413 [SECURITY] [DLA 2981-1] lrzip security updateCVE reference · mailing-list, x_refsource_MLIST
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.