Security readout for executives and security teams
Plain-English summary
CVE-2021-31239 is reported as a denial-of-service issue in SQLite3 3.35.4 involving appendvfs.c. A successful attack could crash or disrupt an affected service, but the bundle does not show data theft or code execution. Business urgency depends on where SQLite is embedded and whether untrusted remote inputs can reach the affected functionality.
Executive priority
Treat this as a high-priority availability risk for systems with exposed or embedded SQLite 3.35.4. It is not currently supported by KEV evidence in the bundle, so prioritize inventory and vendor updates over emergency incident response unless local exposure is confirmed.
Technical view
The record describes a CWE-125 out-of-bounds read in SQLite3 3.35.4, reachable remotely and rated CVSS 3.1 7.5 with high availability impact only. The affected CPE/product metadata is incomplete, so validation should focus on local SQLite versions, embedded copies, and vendor advisories for packaged or appliance software.
Likely exposure
Most likely exposure is software, appliances, or Linux distributions that include SQLite 3.35.4 or a vulnerable embedded SQLite copy. The bundle lists Fedora, Gentoo, and NetApp advisories, but does not provide a complete affected product matrix or CPE list.
Exploitation context
The bundle does not show CISA KEV status or cited evidence of active exploitation. The CVSS vector indicates low-complexity remote denial of service without authentication or user interaction, but no exploit status should be assumed from the provided sources.
Researcher notes
The public metadata is thin: affected vendor/product fields are n/a, and the bundle does not name fixed SQLite versions. Research should verify the appendvfs.c condition against upstream SQLite discussion and downstream advisories before making product-specific claims.
Mitigation direction
- Check upstream, OS, and appliance vendor guidance for CVE-2021-31239.
- Upgrade SQLite or vendor packages when an advisory names this CVE.
- Identify embedded SQLite copies in applications and third-party products.
- Prioritize internet-facing services that process untrusted database files or inputs.
- Monitor vendor advisories for fixed package versions and product-specific workarounds.
Validation and detection
- Inventory SQLite versions in OS packages and bundled application dependencies.
- Confirm whether SQLite 3.35.4 is present in runtime images.
- Review Fedora, Gentoo, NetApp, and upstream SQLite references for applicability.
- Map exposed services that can receive untrusted data reaching SQLite.
- Record compensating controls if no vendor fix is currently available.
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-125: 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-2021-31239 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
- High
- CVSS
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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:N/I:N/A:H3.93.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.sqlite.org/cves.htmlCVE reference
- https://www.sqlite.org/forum/forumpost/d9fce1a89bCVE reference
- https://github.com/Tsiming/Vulnerabilities/blob/main/SQLite/CVE-2021-31239CVE reference
- FEDORA-2023-69264c19f9CVE reference · vendor-advisory
- FEDORA-2023-5c477a04caCVE reference · vendor-advisory
- https://security.netapp.com/advisory/ntap-20230609-0010/CVE reference
- GLSA-202311-03CVE reference · vendor-advisory
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.
Out-of-bounds Read
Out-of-bounds Read represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.