Cisco IOS and IOS XE SNMP Remote Code Execution
CVE-2017-6742 is a buffer overflow vulnerability in the SNMP subsystem of Cisco IOS and Cisco IOS XE Software. A remote attacker can exploit the flaw by sending a crafted SNMP packet to an affected device over IPv4 or IPv6. The issue affects SNMP versions 1, 2c, and 3. According to the provided vendor description, successful exploitation requires valid SNMP access: knowledge of the SNMP read-only community string for SNMPv1/v2c or valid user credentials for SNMPv3. The vulnerable condition can result in either arbitrary code execution on the device or a forced device reload. The content also notes this vulnerability has been used in the wild against exposed Cisco routers, including as an initial access vector preceding deployment of Jaguar Tooth malware.
Are you exposed to this one?
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Unknown (mentioned only as a CVE historically exploited by Fancy Bear; no details provided in this content).
An unauthenticated remote code execution vulnerability in Cisco IOS SNMP functionality affecting older Cisco IOS router firmware, used by APT28 to deploy Jaguar Tooth malware.
Cisco IOS/IOS XE SNMP subsystem memory corruption leading to remote code execution.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.