Security readout for executives and security teams
Plain-English summary
CVE-2020-26213 can crash vulnerable teler deployments when teler runs inside Docker and hits a specific error-exit path. The impact is service availability, not data theft or tampering. The vendor advisory says the issue is fixed in teler 0.0.1 and 0.0.1-dev5.1.
Executive priority
Handle as a moderate availability risk. It should not displace critical remote code execution fixes, but it matters where teler supports production monitoring, detection, or edge traffic visibility. Patch during the next operational maintenance window, sooner for critical Docker deployments.
Technical view
teler before 0.0.1 has a CWE-476 denial-of-service flaw tied to errors.Exit in Docker. The process and process group IDs are not obtained correctly before kill handling, resulting in SIGSEGV. CVSS 3.1 is 5.9: network attack vector, high complexity, no privileges, no user interaction, high availability impact.
Likely exposure
Exposure is limited to organizations running kitabisa teler versions earlier than 0.0.1 inside Docker containers. The sources do not indicate exposure for non-Docker deployments or other products. Prioritize internet-facing or availability-critical teler deployments first.
Exploitation context
The CVE is not listed as KEV, and the provided sources do not report active exploitation. The CVSS vector allows network reachability but rates attack complexity high. Evidence supports a denial-of-service condition, not confidentiality or integrity compromise.
Researcher notes
The source evidence is concise and vendor-confirmed. Key constraints are Docker deployment and the errors.Exit path. No exploit details, broad impact claims, or active exploitation evidence are present in the supplied bundle. Validation should focus on version, containerization, and crash telemetry.
Mitigation direction
- Upgrade teler to 0.0.1 or 0.0.1-dev5.1 or later.
- Prioritize Docker-based teler deployments first.
- Check vendor guidance before applying compensating controls.
- Monitor vulnerable containers for unexpected SIGSEGV crashes.
- Plan rollback-safe updates for availability-critical monitoring paths.
Validation and detection
- Inventory teler deployments and record versions.
- Confirm whether each teler instance runs inside Docker.
- Verify upgraded instances report version 0.0.1 or later.
- Review container crash history for SIGSEGV events.
- Confirm no unsupported pre-0.0.1 images remain deployed.
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-476: 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 lookupContainer behavior lookup
The affected technology mentions containers, so container-specific ATT&CK technique review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2020-26213 mapping review
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Open ATT&CK lookup- Severity
- Medium
- CVSS
- 5.9 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/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:H/PR:N/UI:N/S:U/C:N/I:N/A:H2.23.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.9MediumVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/kitabisa/teler/security/advisories/GHSA-jhj6-5mh6-4pvfCVE reference · x_refsource_CONFIRM
- https://github.com/kitabisa/teler/commit/ec6082049dba9e44a21f35fb7b123d42ce1a1a7eCVE reference · x_refsource_MISC
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.
NULL Pointer Dereference
NULL Pointer Dereference represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.