Security readout for executives and security teams
Plain-English summary
CVE-2020-36254 affects Dropbear before 2020.79. The issue is in scp filename handling for a dot or empty filename. The public record rates it high because successful exploitation could affect confidentiality, integrity, and availability, but the CVSS vector also says attack complexity is high.
Executive priority
Prioritize remediation in exposed environments because the potential impact is broad, but urgency is tempered by high attack complexity and no supplied evidence of active exploitation.
Technical view
Dropbear scp.c mishandles special filename cases involving "." or an empty filename, related to CVE-2018-20685. The CVSS 3.1 vector is AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H. The supplied data identifies Dropbear before 2020.79 and references an upstream commit.
Likely exposure
Exposure is likely limited to systems that include Dropbear before 2020.79 and use or expose its scp functionality. The affected-product metadata in the source bundle is incomplete, so teams should verify packaged and bundled Dropbear versions directly.
Exploitation context
The source bundle does not show CISA KEV listing or other evidence of active exploitation. Treat this as a high-impact vulnerability with high attack complexity, not as a confirmed exploited-in-the-wild issue.
Researcher notes
Evidence is sparse: the affected vendor/product fields are n/a, and the primary technical reference is an upstream commit. Avoid assuming affected downstream products without version confirmation. The CVSS vector supports remote, unauthenticated, no-user-interaction assessment but high complexity.
Mitigation direction
- Upgrade Dropbear to 2020.79 or later where applicable.
- Check OS, appliance, and firmware vendor advisories for patched Dropbear builds.
- Disable unnecessary scp exposure where operationally feasible.
- Prioritize externally reachable or untrusted-access Dropbear deployments.
Validation and detection
- Inventory systems and software bundles for Dropbear versions before 2020.79.
- Confirm whether Dropbear scp functionality is installed, enabled, or reachable.
- Verify vendor package versions include the upstream fix or equivalent backport.
- Review change records against the referenced Dropbear commit.
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
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CVE-2020-36254 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 8.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/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:H/PR:N/UI:N/S:U/C:H/I:H/A:H2.25.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.1HighVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/mkj/dropbear/commit/8f8a3dff705fad774a10864a2e3dbcfa9779ceffCVE 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.