Security readout for executives and security teams
Plain-English summary
Cisco small business RV340, RV340W, RV345, and RV345P VPN routers have authenticated remote code execution flaws in their web management interface. An attacker who can log in could send a crafted HTTP request and run code with the web service process privileges.
Executive priority
Treat this as a moderate priority. It needs timely remediation because routers are edge infrastructure, but the known source evidence requires attacker authentication and does not show active exploitation.
Technical view
The issue affects the web-based management interface of Cisco RV34x series routers. The source says HTTP requests are not properly validated. CVSS 3.1 is 6.3 with network access, low privileges, no user interaction, and low confidentiality, integrity, and availability impact.
Likely exposure
Exposure is most likely where affected RV34x management interfaces are reachable by untrusted networks or broad internal user groups. The bundle does not identify specific affected firmware versions, so asset and firmware validation must use Cisco guidance.
Exploitation context
Exploitation requires authenticated access to the web-based management interface. The CVE is not listed as KEV in the bundle, and the provided sources do not state active exploitation.
Researcher notes
Focus validation on model coverage, firmware status, management interface reachability, and credential exposure. The bundle lists CWE-502, while the description emphasizes improper HTTP request validation; avoid assuming deeper root cause details without vendor data.
Mitigation direction
- Identify RV340, RV340W, RV345, and RV345P routers in inventory.
- Check Cisco’s advisory for fixed firmware or vendor-recommended action.
- Restrict web management access to trusted administrative networks.
- Remove unnecessary management exposure from the internet or untrusted segments.
- Review router administrator accounts and remove unused credentials.
Validation and detection
- Confirm model and firmware version for each RV34x router.
- Verify whether the web management interface is reachable from untrusted networks.
- Compare firmware status against Cisco’s advisory.
- Review management logs for unusual authenticated requests or administrative 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-502: Code execution behavior lookup
Code execution and unsafe deserialization weaknesses often justify reviewing execution behavior and process 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 lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-1414 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
- 6.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
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:L/UI:N/S:U/C:L/I:L/A:L2.83.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Source materials
- CVE List V5 sourceCVE List V5
- 20210407 Cisco RV340, RV340W, RV345, and RV345P Dual WAN Gigabit VPN Routers Authenticated Remote Code Execution VulnerabilitiesCVE reference · vendor-advisory, x_refsource_CISCO
- https://www.zerodayinitiative.com/advisories/ZDI-21-559/CVE reference · x_refsource_MISC
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.
Deserialization of Untrusted Data
Deserialization of Untrusted Data represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.