Security readout for executives and security teams
Plain-English summary
CVE-2021-1259 lets a logged-in remote user abuse Cisco SD-WAN vManage's web management interface to write sensitive files through path traversal. It is not described as unauthenticated or actively exploited, but arbitrary file write on a network management platform can create meaningful operational risk.
Executive priority
Treat this as a scheduled but important remediation item. It is not sourced as actively exploited, but vManage controls SD-WAN operations, and an authenticated arbitrary file write could affect management integrity.
Technical view
Cisco describes insufficient HTTP request validation in SD-WAN vManage Software. A crafted authenticated request containing directory traversal sequences can provide write access to sensitive files. CVSS v3.0 is 5.3, with network access, high attack complexity, low privileges required, no user interaction, and high integrity impact.
Likely exposure
Exposure is limited to organizations running Cisco SD-WAN vManage where authenticated users can reach the web-based management interface. The source bundle does not provide affected version ranges, so teams must verify release status against Cisco's advisory.
Exploitation context
The provided sources do not state active exploitation, and KEV status is false. Exploitation requires authentication and high complexity, but the target is a management system and the impact is arbitrary file write on the affected system.
Researcher notes
Evidence supports CWE-22 path traversal in Cisco SD-WAN vManage's web interface with arbitrary file write. The bundle does not include version ranges, proof-of-concept details, confirmed exploitation, or specific fixed releases, so validation should stay tied to Cisco's advisory.
Mitigation direction
- Check Cisco's advisory for affected and fixed vManage releases, then plan the appropriate upgrade.
- Restrict vManage management interface access to trusted admin networks and VPN paths.
- Review and tighten vManage user roles to reduce low-privilege account exposure.
- Monitor vendor guidance for any updated mitigation or fixed-release details.
Validation and detection
- Inventory Cisco SD-WAN vManage deployments and record software versions.
- Compare installed versions with Cisco's advisory for affected or fixed release status.
- Confirm the vManage web interface is not broadly reachable.
- Review authentication and web logs for path traversal indicators or unusual file-write activity.
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-22: File access and web shell behavior lookup
File traversal and upload weaknesses can lead teams to review file, web shell, execution, and collection telemetry. 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 lookupFile access behavior lookup
The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-1259 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
- 5.3 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/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:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N1.63.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
5.3MediumVector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N
Source materials
- CVE List V5 sourceCVE List V5
- 20210120 Cisco SD-WAN vManage Software Path Traversal 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.