High Severity Stack‑Based Buffer Overflow in Cisco Small Business RV Series Routers (CVE‑2022‑20700)
What It Is
CVE‑2022‑20700 is a stack‑based buffer overflow discovered in the firmware of Cisco Small Business RV160, RV260, RV340, and RV345 series routers. The flaw can be triggered by crafted network traffic, allowing an attacker to execute arbitrary code, elevate privileges, bypass authentication, or cause a denial‑of‑service condition.
Exploitability
The vulnerability is publicly disclosed and assigned a High CVSS rating. Proof‑of‑concept exploits have been shared in security research communities, and no known active exploitation campaigns have been reported at the time of writing. However, the ease of remote trigger on a network‑exposed device makes it a credible risk.
Affected Products
- Cisco Small Business RV160 Series Router
- Cisco Small Business RV260 Series Router
- Cisco Small Business RV340 Series Router
- Cisco Small Business RV345 Series Router
Why It Matters for Compliance & Audit Readiness
The ability to bypass authentication and execute code directly undermines access‑control assurances required by frameworks such as NIST 800‑53 AC‑2/AC‑3 and ISO 27001 A.9.2. From a control‑assurance perspective, organizations must demonstrate that vendor‑supplied network devices are continuously monitored for critical vulnerabilities and that remediation evidence is retained. Failure to patch this high‑severity flaw can be cited as a lapse in vendor‑management and access‑control controls during audits.
Recommended Actions
- Patch Immediately – Deploy Cisco’s latest firmware that addresses CVE‑2022‑20700 on all affected RV series routers.
- Inventory & Prioritize – Verify that every RV160/260/340/345 device is accounted for in your asset register and prioritized for remediation.
- Map to Access‑Control Controls – Document the remediation as evidence for AC‑2 (Account Management) and AC‑3 (Access Enforcement) controls.
- Validate Post‑Patch – Conduct vulnerability scans or penetration tests to confirm the buffer overflow is mitigated.
- Update Vendor‑Management Process – Incorporate this CVE into your vendor risk assessment workflow to ensure future firmware releases are evaluated promptly.
Source: CISA KEV – CVE‑2022‑20700