Security readout for executives and security teams
Plain-English summary
This vulnerability affects several Cisco Small Business RV routers. An attacker who already has valid administrator credentials could abuse the web management interface to run code as root or force the router to restart, disrupting connectivity.
Executive priority
Treat this as high priority for small business network edge devices. The credential requirement reduces likelihood, but root-level execution and router reloads can affect confidentiality, integrity, and availability at a network boundary.
Technical view
CVE-2021-1344 is an authenticated remote command execution and denial-of-service issue in Cisco RV016, RV042, RV042G, RV082, RV320, and RV325 router firmware. Cisco attributes it to improper validation of user-supplied input in crafted HTTP requests to the web management interface. The listed CWE is CWE-121.
Likely exposure
Exposure is most likely where affected RV Series routers are still deployed, their web management interface is reachable, and administrator credentials are compromised or misused. The bundle does not identify specific affected firmware versions.
Exploitation context
The source bundle does not report active exploitation, and KEV status is false. Exploitation requires valid administrator credentials and crafted HTTP requests to the management interface. Successful exploitation may provide root-level code execution or cause a reload-based denial of service.
Researcher notes
The CVSS 3.1 score is 7.2 with AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H. Evidence supports authenticated remote exploitation through the web management interface, but the bundle does not provide exploit status, fixed versions, or detailed workaround text.
Mitigation direction
- Check Cisco’s advisory for fixed firmware, official workarounds, and product-specific guidance.
- Inventory Cisco RV016, RV042, RV042G, RV082, RV320, and RV325 routers.
- Restrict web management access to trusted administrative networks only.
- Review and rotate administrator credentials for affected devices.
- Plan replacement if vendor-supported fixes are unavailable for deployed hardware.
Validation and detection
- Identify deployed router models and firmware versions from asset records or management consoles.
- Confirm whether the web management interface is reachable from untrusted networks.
- Review administrator account lists for stale, shared, or unexpected accounts.
- Check device logs for unexpected administrative access or unexplained reloads.
- Compare findings against Cisco’s advisory before declaring systems remediated.
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-2021-1344 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.
