Security readout for executives and security teams
Plain-English summary
This flaw affects Cisco SD-WAN vManage, listed as Cisco Catalyst SD-WAN Manager in the bundle. A low-privileged authenticated local attacker could abuse path validation in file transfer functions to overwrite system files and potentially become more privileged on the underlying operating system.
Executive priority
Prioritize remediation for SD-WAN management environments because compromise could affect the control plane. This is high severity, but urgency depends on whether attackers can obtain authenticated local access to the manager.
Technical view
The vulnerability is improper validation of path input in system file transfer functions. With local authenticated access, an attacker could submit crafted path variables, overwrite arbitrary files, and alter the system to gain elevated privileges. Cisco rates it high severity with CVSS 3.1 score 7.8.
Likely exposure
Exposure is limited to organizations running affected Cisco Catalyst SD-WAN Manager or Cisco SD-WAN vManage versions from the listed release ranges. The attacker needs authenticated local access, so risk is highest where management systems have weak account control, shared credentials, or broad administrative access.
Exploitation context
The source bundle does not show CISA KEV listing or public evidence of active exploitation. It does support plausible privilege escalation after authenticated local access. This is not described as a remote unauthenticated compromise.
Researcher notes
Focus validation on version exposure, local authenticated access paths, and whether file transfer functions are reachable by low-privileged users. Evidence provided does not name exploit code, active exploitation, or alternative mitigations beyond Cisco updates.
Mitigation direction
- Upgrade to Cisco software versions that address this advisory.
- Do not rely on workarounds; Cisco states none address this vulnerability.
- Restrict local and administrative access to SD-WAN Manager systems.
- Review Cisco advisory guidance for fixed-release selection.
Validation and detection
- Inventory Cisco Catalyst SD-WAN Manager and SD-WAN vManage versions.
- Compare installed versions with the affected versions in the advisory.
- Confirm the Cisco security update has been applied successfully.
- Review local accounts and authentication paths for unnecessary access.
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
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ATT&CK lookup starting points
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CWE-250: Exact CWE lookup
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Open ATT&CK lookupPrivilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2020-26074 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/RL:X/RC:X/E:X
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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/RL:X/RC:X/E:X1.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/RL:X/RC:X/E:X
Source materials
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.
Execution with Unnecessary Privileges
Execution with Unnecessary Privileges represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.