Security readout for executives and security teams
Plain-English summary
This flaw affects several Cisco Small Business RV routers. An attacker with valid administrator credentials could use the web management interface to run code as root or force a restart. The business risk is highest where these routers remain internet-reachable or use weakly controlled admin access.
Executive priority
Treat this as a high-priority legacy network-device risk. It is not cited as actively exploited here, but successful abuse gives root-level control or service disruption after admin credential compromise.
Technical view
CVE-2021-1319 is a high-severity authenticated remote command execution and denial-of-service issue in the web-based management interface of Cisco RV016, RV042, RV042G, RV082, RV320, and RV325 routers. The stated root cause is improper validation of user input, with CWE-121 listed. Exploitation requires administrator credentials.
Likely exposure
Exposure is limited to organizations running the listed Cisco Small Business RV routers, especially where the management interface is reachable by untrusted networks or admin credentials are shared, stale, or compromised.
Exploitation context
The supplied sources do not show CISA KEV listing or active exploitation. Exploitation is remote over HTTP but requires valid administrator credentials, reducing opportunistic risk while keeping post-credential-compromise impact high.
Researcher notes
The key constraints are affected-model confirmation and credential requirement. The bundle does not provide exploit proof, patch versions, or KEV evidence. Avoid assuming unauthenticated exposure or active exploitation without additional vendor or threat-intelligence confirmation.
Mitigation direction
- Review Cisco advisory cisco-sa-rv-overflow-ghZP68yj for available fixed software or migration guidance.
- Inventory Cisco RV016, RV042, RV042G, RV082, RV320, and RV325 routers.
- Restrict web management access to trusted administrator networks.
- Audit administrator accounts and remove stale or shared credentials.
- Monitor affected routers for unexpected reloads or unauthorized administrative activity.
Validation and detection
- Confirm whether any listed Cisco RV router models are deployed.
- Check whether their web management interfaces are reachable from untrusted networks.
- Verify current firmware status against Cisco’s advisory guidance.
- Review administrative account inventory and recent login activity.
- Look for unexplained device reloads or configuration changes.
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-2021-1319 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.
