Security readout for executives and security teams
Plain-English summary
CVE-2021-34182 describes arbitrary code execution in ttyd v1.6.3 tied to default configuration permissions. The public record rates it critical with network access, no authentication, and no user interaction required. The source bundle does not identify a patch, fixed version, or confirmed exploitation.
Executive priority
Treat as urgent for any organization running ttyd v1.6.3, particularly if exposed beyond trusted administrators. Business risk is high because the public CVSS assessment indicates full confidentiality, integrity, and availability impact.
Technical view
The CVE maps to CWE-276, incorrect default permissions. CVSS 3.1 is 9.8: AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. Public affected-product metadata is incomplete, but the title and description specifically name ttyd v1.6.3.
Likely exposure
Exposure is most likely where ttyd v1.6.3 is deployed with default permissions, especially if the terminal service is reachable over a network. The CVE metadata does not provide CPEs or broader affected version ranges.
Exploitation context
The CVSS vector indicates remote, low-complexity exploitation without privileges or user interaction. CISA KEV is false in the provided bundle, and no cited source confirms active exploitation.
Researcher notes
Evidence is thin: the CVE record and issue reference state the condition but do not provide detailed affected CPEs, a fix version, or exploitation telemetry. Avoid expanding impact beyond ttyd v1.6.3 without additional vendor evidence.
Mitigation direction
- Inventory ttyd deployments and identify any v1.6.3 instances.
- Check the ttyd issue and vendor repository for official remediation guidance.
- Restrict ttyd access to trusted administrative networks while assessing exposure.
- Review default permissions and disable unsafe defaults where vendor guidance supports it.
Validation and detection
- Confirm whether ttyd v1.6.3 exists in production, staging, or tooling hosts.
- Verify whether any ttyd service is reachable from untrusted networks.
- Compare local configuration permissions against vendor guidance from the referenced issue.
- Document compensating controls until an official fix path is confirmed.
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-276: 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 lookupCVE-2021-34182 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://github.com/tsl0922/ttyd/issues/692CVE 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.
Incorrect Default Permissions
Incorrect Default Permissions represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.