CVE-2016-6366 Cisco Adaptive Security Appliance (ASA): memory-safety flaw
In plain words: The program mishandles the memory it uses to keep track of data. A specially made input can scramble that memory. Usually lets an attacker crash the program or run their own code with its permissions.
Confirmed exploited by CISA on · US federal patch deadline Jun 14, 2022
What to do
- Install Cisco's security update for Adaptive Security Appliance (ASA). If no update exists, follow the vendor's workaround or stop using the product until one ships.
- Patch edge devices first — attackers often start scanning for them within hours of a fix.
- Never expose the device's admin page to the internet.
- After patching a device that was exposed, follow the vendor's compromise checks, end active sessions and change passwords.
Who is affected
Work IT. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.
What's at risk: They face the internet and guard the whole network, so a flaw here can hand attackers a way in — and these devices usually run no antivirus, so break-ins go unnoticed.
The details
- Official name
- Cisco Adaptive Security Appliance (ASA) SNMP Buffer Overflow Vulnerability
- Product
- Cisco Adaptive Security Appliance (ASA)
- CISA description
- A buffer overflow vulnerability in the Simple Network Management Protocol (SNMP) code of Cisco ASA software could allow an attacker to cause a reload of the affected system or to remotely execute code.
- Type of flaw
- Memory-safety flaw (CWE-119)
- Confirmed exploited
- May 24, 2022
- US federal patch deadline
- Jun 14, 2022
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Answering about CVE-2016-6366 ·
Questions about CVE-2016-6366
Is CVE-2016-6366 being exploited?
Yes. CISA added CVE-2016-6366 to its Known Exploited Vulnerabilities catalog on May 24, 2022, which means there is reliable evidence of real-world attacks.
How do I fix CVE-2016-6366?
Install Cisco's security update for Adaptive Security Appliance (ASA). If no update exists, follow the vendor's workaround or stop using the product until one ships. Patch edge devices first — attackers often start scanning for them within hours of a fix.
Am I affected by CVE-2016-6366?
Only if you use Cisco Adaptive Security Appliance (ASA). Aimed mostly at company systems — you are affected through the companies you use, not your own phone.