Security readout for executives and security teams
Plain-English summary
Cisco SD-WAN vManage has a local information disclosure flaw. A logged-in local attacker could read files that should be protected, potentially using sensitive data to forge authentication requests and access the vManage web interface.
Executive priority
Treat as a moderate-priority infrastructure control issue. It is not remotely exploitable from the evidence provided, but vManage is a high-value network management system and credential exposure could enable unauthorized administrative access.
Technical view
CVE-2021-34700 affects the CLI interface of Cisco SD-WAN vManage Software. Insufficient control over sensitive information can allow an authenticated local attacker with low privileges to read arbitrary filesystem content. The CVSS 3.1 score is 5.5, with high confidentiality impact and no integrity or availability impact listed.
Likely exposure
Exposure is mainly for organizations running Cisco SD-WAN vManage where untrusted or weakly controlled users can authenticate locally or reach CLI functions. The source bundle does not specify affected versions.
Exploitation context
The provided sources do not report active exploitation, and the CVE is not marked KEV. Exploitation requires authenticated local access, which limits reach but can matter in shared administration, compromised account, or insider-risk scenarios.
Researcher notes
Key uncertainty is affected-version and remediation detail; the bundle lists versions as n/a. The important validation question is whether local authenticated users can access CLI paths that expose sensitive filesystem content on deployed vManage systems.
Mitigation direction
- Review Cisco’s advisory for affected releases and fixed software guidance.
- Restrict vManage CLI access to trusted administrators only.
- Audit local accounts and remove unnecessary privileges.
- If exposure is suspected, follow vendor guidance for credential and secret handling.
- Monitor vManage web UI authentication for unusual access patterns.
Validation and detection
- Inventory Cisco SD-WAN vManage deployments and installed versions.
- Compare each deployment against Cisco’s advisory.
- Review who has local or CLI access to vManage.
- Check authentication logs for unexpected web UI access.
- Document compensating controls if immediate upgrade is not possible.
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
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CWE-522: Credential and account abuse lookup
Authentication and credential weaknesses can make valid-account abuse and credential telemetry useful review starting points. 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-2021-34700 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
- Medium
- CVSS
- 5.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
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:N/A:N1.83.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.5MediumVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- 20210721 Cisco SD-WAN vManage Software Information Disclosure VulnerabilityCVE reference · vendor-advisory, x_refsource_CISCO
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.
Insufficiently Protected Credentials
Insufficiently Protected Credentials represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.