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PatchSiren cyber security CVE debrief

CVE-2017-6739 Cisco CVE debrief

CVE-2017-6739 is a Cisco IOS and IOS XE Software SNMP remote code execution vulnerability that CISA has listed in its Known Exploited Vulnerabilities catalog. That KEV status makes this a defensive priority for any environment running affected Cisco network devices, especially where SNMP is enabled or reachable from management or adjacent networks. The supplied CISA entry directs defenders to apply updates per vendor instructions, with a KEV remediation due date of 2022-03-24 in the provided timeline.

Vendor
Cisco
Product
IOS and IOS XE Software
CVSS
HIGH 8.8
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

Network and security teams responsible for Cisco IOS and IOS XE devices, especially infrastructure exposed to SNMP or managed through centralized network operations tooling. Asset owners should also care if these devices support critical routing, switching, or remote administration functions.

Technical summary

The supplied corpus identifies the issue as an SNMP-related remote code execution vulnerability in Cisco IOS and IOS XE Software. The most important operational fact in the provided sources is that CISA included it in the Known Exploited Vulnerabilities catalog, indicating active exploitation concern and a need to remediate using Cisco’s vendor guidance. No CVSS score was provided in the supplied data, so prioritization here is driven by KEV status rather than a severity score.

Defensive priority

High. KEV inclusion and a short remediation window indicate this should be treated as urgent patching work for exposed or business-critical Cisco network infrastructure.

Recommended defensive actions

  • Identify all Cisco IOS and IOS XE devices in inventory and confirm whether SNMP is enabled or exposed.
  • Apply Cisco updates and follow the vendor instructions referenced by CISA.
  • Prioritize internet-facing, externally reachable, and business-critical network devices first.
  • Verify remediation before the KEV due date and document any exceptions with compensating controls.
  • Restrict SNMP access to trusted management networks where operationally feasible.

Evidence notes

This debrief is based only on the supplied CISA KEV feed item and the official CVE/NVD resource links provided in the corpus. The corpus labels the vulnerability as Cisco IOS and IOS XE Software SNMP Remote Code Execution Vulnerability and marks it as a known exploited vulnerability. The provided timeline shows CISA KEV dateAdded 2022-03-03 and dueDate 2022-03-24. No additional technical details, exploit mechanics, or CVSS score were present in the supplied sources.

Sources and references

Verified primary and authoritative sources

  • CVE-2017-6739 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2017-6739

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2017-6739 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2017-6739

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

  • CISA Known Exploited Vulnerabilities catalog

    Publisher, destination, and source semantics verified

    URL: https://www.cisa.gov/known-exploited-vulnerabilities-catalog

    Cybersecurity and Infrastructure Security Agency - Official CISA catalog of vulnerabilities known to be exploited in the wild.

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

    cisa_kev

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.