Security readout for executives and security teams
Plain-English summary
This is a Cisco SD-WAN issue where a highly privileged local user could corrupt arbitrary files on an affected device. The business risk is integrity damage, not data theft or remote takeover based on the provided CVSS vector. It matters most where many administrators or support users have CLI access.
Executive priority
Treat as a controlled but real integrity risk. Prioritize environments with shared administrator accounts, third-party operational access, or high-change SD-WAN infrastructure. This is not evidenced as remotely exploitable or actively exploited in the provided sources.
Technical view
The vulnerability is in the Cisco SD-WAN Software CLI. An authenticated local attacker with high privileges could pass crafted parameters to a specific CLI command and overwrite files on the underlying host filesystem. CVSS is 4.4: local attack vector, low complexity, high privileges required, no user interaction, high integrity impact.
Likely exposure
Exposure is limited to affected Cisco SD-WAN systems where a user already has local, high-privilege CLI access. The bundle does not identify affected versions, deployment roles, or vulnerable appliances beyond Cisco SD-WAN Solution.
Exploitation context
The bundle does not show CISA KEV listing or active exploitation evidence. Exploitation requires authenticated local access and high privileges, which lowers broad internet-scale risk but remains relevant for insider misuse, compromised administrator accounts, or poorly controlled operational access.
Researcher notes
Key evidence is Cisco’s description and CVSS vector. The source bundle lacks affected release details, fixed versions, workaround text, and exploit-in-the-wild reporting. Avoid claiming broader product impact or remote exploitation without the Cisco advisory details.
Mitigation direction
- Review the Cisco advisory for fixed releases and official upgrade guidance.
- Inventory Cisco SD-WAN systems and map them to Cisco advisory applicability.
- Restrict privileged CLI access to necessary administrators only.
- Review administrator account hygiene and remove stale privileged users.
- Monitor sensitive file integrity on affected SD-WAN hosts where feasible.
Validation and detection
- Confirm whether Cisco SD-WAN Software is deployed in the environment.
- Check installed versions against the Cisco advisory, not assumptions.
- Review who has local or CLI administrative access to SD-WAN systems.
- Inspect administrative logs for unexpected CLI activity by privileged users.
- Verify remediation status after applying Cisco-recommended updates or controls.
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-552: 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 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-2021-1512 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
- 4.4 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:L/AC:L/PR:H/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:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N0.83.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
4.4MediumVector: CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N
Source materials
- CVE List V5 sourceCVE List V5
- 20210505 Cisco SD-WAN Software Arbitrary File Corruption 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.
Files or Directories Accessible to External Parties
Files or Directories Accessible to External Parties represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.