Security readout for executives and security teams
Plain-English summary
This flaw affects Cisco Small Business RV-series router management interfaces. An attacker with valid administrator credentials could send malicious web requests that run code as root or crash the device, disrupting routing services. The source bundle does not show active exploitation.
Executive priority
Treat this as a high-priority edge-device risk where affected Cisco RV routers remain in service. The requirement for administrator credentials lowers broad opportunistic risk, but compromise of a router admin account could lead to root-level device control or outage.
Technical view
CVE-2021-1323 is an authenticated remote command execution and denial-of-service issue in the web management interface of Cisco RV016, RV042, RV042G, RV082, RV320, and RV325 routers. Cisco attributes it to improper validation of user input. CVSS is 7.2, with high privileges required and high impact to confidentiality, integrity, and availability.
Likely exposure
Exposure is most likely where listed Cisco Small Business RV routers are still deployed and their web-based management interface is reachable by administrators. Internet-reachable management interfaces increase business risk, but the attacker must already have valid administrator credentials.
Exploitation context
The provided sources describe exploitation through crafted HTTP requests to the management interface after authentication as an administrator. The CVE is not marked as CISA KEV, and the bundle provides no cited evidence of active exploitation or public exploit use.
Researcher notes
Evidence is limited to the CVE data and Cisco advisory reference in the bundle. Do not assume unauthenticated reachability, active exploitation, or specific fixed versions unless confirmed from Cisco’s advisory for the deployed model and firmware line.
Mitigation direction
- Check Cisco’s advisory for fixed firmware and supported remediation guidance.
- Restrict management interface access to trusted administrative networks or VPN.
- Review and remove unnecessary administrator accounts on affected routers.
- Prioritize replacement planning for unsupported affected router models.
- Monitor for unexpected router reloads or management-interface activity.
Validation and detection
- Inventory Cisco RV016, RV042, RV042G, RV082, RV320, and RV325 devices.
- Confirm firmware versions and support status against Cisco’s advisory.
- Verify management interfaces are not exposed to untrusted networks.
- Review administrator account lists and recent login records.
- Check logs for unusual HTTP management requests or unexplained reloads.
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-121: 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 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-2021-1323 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
- 7.2 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
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:H/UI:N/S:U/C:H/I:H/A:H1.25.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.2HighVector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- 20210203 Cisco Small Business RV Series Routers Management Interface Remote Command Execution and Denial of Service 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.
Stack-based Buffer Overflow
Stack-based Buffer Overflow represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.