Security readout for executives and security teams
Plain-English summary
CVE-2021-3305 is a reported untrusted search path issue in Feishu v3.40.3. In practical terms, a local attacker may be able to abuse how the application finds code or dependencies, potentially leading to code execution with serious confidentiality, integrity, and availability impact. The public record does not show active exploitation or a named fix.
Executive priority
Treat as a high-priority endpoint hygiene issue if Feishu v3.40.3 is present. Prioritize inventory and vendor update checks. Business urgency is lower than internet-facing remote code execution, but potential endpoint compromise impact is high if abused.
Technical view
The CVE describes CWE-426 in Beijing Feishu Technology Co., Ltd Feishu v3.40.3. CVSS 3.1 is 7.8: local attack vector, low complexity, no privileges required, user interaction required, unchanged scope, and high CIA impact. Affected CPE data and remediation details are not provided in the bundle.
Likely exposure
Exposure is most relevant to managed endpoints where Feishu v3.40.3 is installed. Based on the CVSS vector, this is not described as remotely exploitable over the network; it requires local context and user interaction. Organizations without Feishu, or without this version, are unlikely to be exposed.
Exploitation context
The source bundle lists a public GitHub issue but no CISA KEV entry and no cited confirmation of active exploitation. The risk is higher on workstations where users run software from untrusted locations or where local file placement controls are weak.
Researcher notes
Evidence is sparse: the CVE description, CVSS vector, CWE-426 classification, and one GitHub issue are the main public references in the bundle. No affected CPEs, patch version, workaround, or active exploitation confirmation are provided. Avoid assuming broader Feishu versions are affected without vendor evidence.
Mitigation direction
- Inventory Feishu installations and identify any v3.40.3 deployments.
- Check Feishu vendor guidance for an official fixed version or mitigation.
- Upgrade or remove affected Feishu installations if vendor guidance supports it.
- Restrict execution from untrusted or user-writable locations where feasible.
- Use endpoint controls to monitor suspicious local code-loading behavior.
Validation and detection
- Confirm whether Feishu v3.40.3 exists in endpoint software inventory.
- Review vendor release notes or support channels for CVE-2021-3305 guidance.
- Verify affected systems are updated, removed, or risk-accepted.
- Check endpoint security telemetry for unusual Feishu-related child processes or load behavior.
- Document compensating controls if no vendor fix is 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-426: 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-2021-3305 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
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/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.
SSVC decision data
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:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H1.85.9CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/liong007/Feishu/issues/1CVE reference, mitre
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.
Untrusted Search Path
Untrusted Search Path represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.