Cisco IOS XE SNMP Request Parsing DoS
CVE-2025-20312 is a denial-of-service vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS XE Software. According to the provided content, the flaw is caused by improper error handling when parsing a specific SNMP request. A remote attacker with valid SNMP access can send a crafted SNMP request that triggers the vulnerable parsing path and causes the affected device to reload unexpectedly. The issue affects SNMP versions 1, 2c, and 3 on affected Cisco IOS XE devices.
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 public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Recent activity
5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A remote denial-of-service vulnerability in SNMP affecting Cisco IOS XE devices.
A remote SNMP denial-of-service vulnerability affecting Cisco IOS XE devices.
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.