Security readout for executives and security teams
Plain-English summary
CVE-2021-20204 is a critical memory-safety flaw in libgetdata v0.10.0. A malicious dirfile database can corrupt heap memory in software that uses this library. Business impact depends on whether exposed applications process untrusted dirfile data, but the stated impact includes confidentiality, integrity, availability, code execution, and privilege escalation risks.
Executive priority
Treat as high-priority remediation where libgetdata is used in exposed ingestion, analytics, or file-processing services. The severity is critical, but urgency should be driven by confirmed use of libgetdata v0.10.0 and whether untrusted dirfile databases are processed.
Technical view
The issue is a use-after-free heap memory corruption flaw in libgetdata v0.10.0 when handling crafted dirfile databases. The CVSS 3.1 score is 9.8 with network, low-complexity, no-privilege, no-user-interaction characteristics. The CVE maps to CWE-119 and affects third-party software embedding or linking against libgetdata.
Likely exposure
Most likely exposure is software, services, or scientific/data-processing pipelines that use libgetdata/getdata and accept dirfile databases from users, partners, network sources, or automated ingestion. Systems using only trusted local dirfile data have lower practical exposure, but still need inventory confirmation.
Exploitation context
The provided bundle does not show CISA KEV listing or cited active exploitation. Exploitation would require a vulnerable libgetdata path processing a malicious dirfile database. The CVE states possible arbitrary code execution or privilege escalation, but actual impact depends on process privileges and deployment context.
Researcher notes
Evidence supports a libgetdata v0.10.0 use-after-free during malicious dirfile parsing, with distro advisories from Debian and Fedora. The bundle does not provide exploit artifacts, KEV status, or a universal upstream fixed version. Validate exposure through dependency inventory and dirfile input paths.
Mitigation direction
- Apply applicable Debian or Fedora security updates for libgetdata/getdata packages.
- Inventory applications statically or dynamically linked against libgetdata v0.10.0.
- Restrict processing of untrusted dirfile databases until patched or vendor guidance is confirmed.
- For bundled copies, check vendor guidance and rebuild against a fixed library.
- Prioritize internet-facing or automated ingestion workflows that process externally supplied files.
Validation and detection
- Check package inventory for libgetdata or getdata version v0.10.0.
- Review SBOMs and build manifests for bundled libgetdata copies.
- Identify applications that accept dirfile databases from untrusted sources.
- Confirm Debian or Fedora advisory updates are installed where applicable.
- Verify vulnerable workflows no longer run against libgetdata v0.10.0.
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-119: 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 lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupPrivilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-20204 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
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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 vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://bugzilla.redhat.com/show_bug.cgi?id=1956348CVE reference · x_refsource_MISC
- [debian-lts-announce] 20210513 [SECURITY] [DLA 2660-1] libgetdata security updateCVE reference · mailing-list, x_refsource_MLIST
- FEDORA-2021-e2b64c614bCVE reference · vendor-advisory, x_refsource_FEDORA
- FEDORA-2021-3b8bb26909CVE reference · vendor-advisory, x_refsource_FEDORA
- FEDORA-2021-197545a753CVE reference · vendor-advisory, x_refsource_FEDORA
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.
Improper Restriction of Operations within the Bounds of a Memory Buffer
Improper Restriction of Operations within the Bounds of a Memory Buffer represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.