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PatchSiren cyber security CVE debrief

CVE-2022-20708 Cisco CVE debrief

CVE-2022-20708 is a Cisco Small Business RV Series router vulnerability described as a stack-based buffer overflow affecting RV160, RV260, RV340, and RV345 series devices. It was added to CISA’s Known Exploited Vulnerabilities catalog on 2022-03-03, which indicates active exploitation or evidence of exploitation significant enough to require prioritized remediation. Organizations using the affected routers should treat this as a high-priority patching item and apply Cisco’s vendor guidance without delay.

Vendor
Cisco
Product
Small Business RV160, RV260, RV340, and RV345 Series Routers
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2022-03-03
Original CVE updated
2022-03-03
Advisory published
2022-03-03
Advisory updated
2022-03-03

Who should care

Administrators and security teams responsible for Cisco Small Business RV160, RV260, RV340, or RV345 series routers should prioritize this issue, especially where these devices support business network access or remote management.

Technical summary

The supplied record identifies a stack-based buffer overflow in Cisco Small Business RV Series routers. The source corpus does not include deeper technical detail about the vulnerable code path, attack prerequisites, or specific impact, so the safest defensible summary is that affected router firmware contains a memory-safety flaw serious enough to be included in CISA’s KEV catalog. CISA’s entry directs defenders to apply updates per vendor instructions.

Defensive priority

High. The vulnerability is listed in CISA KEV with a required action to apply updates, and the KEV due date is 2022-03-17.

Recommended defensive actions

  • Identify any Cisco Small Business RV160, RV260, RV340, and RV345 series routers in your environment.
  • Apply Cisco updates and follow Cisco’s vendor instructions as soon as possible.
  • Treat exposure as urgent if the device is internet-facing or provides remote administration.
  • Use the CISA KEV due date of 2022-03-17 as the remediation target.
  • Verify remediation after updating and confirm the devices remain on supported firmware.
  • Monitor Cisco advisories and your asset inventory for additional affected models or related guidance.

Evidence notes

This debrief is based only on the supplied CVE metadata and official references. The record names the issue as a stack-based buffer overflow in Cisco Small Business RV160/RV260/RV340/RV345 routers, and CISA KEV marks it as known exploited with the instruction to apply updates per vendor guidance. No CVSS score or additional attack-details were provided in the source corpus.

Official resources

Publicly disclosed on 2022-03-03 and added to CISA KEV the same day. The supplied record does not include a CVSS score.