Security readout for executives and security teams
Plain-English summary
CVE-2021-1297 affects several Cisco Small Business VPN routers. An unauthenticated remote attacker could abuse the web management interface to write files into restricted locations, potentially altering device behavior or configuration. The business risk is highest where these routers manage branch, small-office, or remote-access connectivity.
Executive priority
Prioritize remediation for internet-exposed or business-critical routers. The vulnerability does not indicate data theft by itself, but unauthorized file overwrite on network edge devices can undermine trust in connectivity and remote access controls.
Technical view
The issue is an insufficient input validation flaw in the web-based management interface of Cisco RV160, RV160W, RV260, RV260P, and RV260W routers. It enables directory traversal during file upload and may overwrite restricted files. CVSS 3.1 is 7.5, network reachable, low complexity, no privileges, and integrity impact high.
Likely exposure
Exposure is limited to organizations running the named Cisco Small Business RV160/RV260 family VPN routers. Risk increases if the web management interface is reachable from the internet or other untrusted networks.
Exploitation context
The provided sources do not state active exploitation, and this CVE is not marked as CISA KEV. The flaw is remotely reachable and unauthenticated, but the source bundle does not provide exploit maturity details.
Researcher notes
CWE-36 directory traversal is cited. The key technical condition is insufficient validation in the web management upload path. The source bundle confirms product scope and impact but does not include fixed version details or public exploit evidence.
Mitigation direction
- Check Cisco's advisory for affected and fixed firmware guidance.
- Upgrade affected routers according to Cisco's published instructions.
- Restrict management interface access to trusted administrative networks.
- Disable external management exposure where it is not required.
- Review router backups and configuration integrity after remediation.
Validation and detection
- Inventory RV160, RV160W, RV260, RV260P, and RV260W devices.
- Record firmware versions and compare them with Cisco's advisory.
- Confirm management interfaces are not exposed to untrusted networks.
- Review logs for unexpected management access or file/configuration changes.
- Use non-invasive checks; avoid production upload or traversal testing.
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-36: 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-2021-1297 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
- High
- CVSS
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N3.93.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source materials
- CVE List V5 sourceCVE List V5
- 20210203 Cisco Small Business RV160, RV160W, RV260, RV260P, and RV260W VPN Routers Arbitrary File Write VulnerabilitiesCVE 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.
Absolute Path Traversal
Absolute Path Traversal represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.