CVE-2026-20012 Details
A vulnerability in the Internet Key Exchange version 2 (IKEv2) feature of Cisco IOS Software, Cisco IOS XE Software, Cisco Secure Firewall Adaptive Security Appliance (ASA) Software, and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to trigger a memory leak, resulting in a denial of service (DoS) condition on an affected device.
This vulnerability is due to improper parsing of IKEv2 packets. An attacker could exploit this vulnerability by sending crafted IKEv2 packets to an affected device. A successful exploit of Cisco IOS Software and IOS XE Software could allow the attacker to cause the affected device to reload, resulting in a DoS condition. A successful exploit of Cisco Secure Firewall ASA Software and Secure FTD Software could allow the attacker to partially exhaust system memory, resulting in system instability, such as the inability to establish new IKEv2 VPN sessions. A manual reboot of the device is required to recover from this condition.
View at NVD
Exploit prediction scoring system (EPSS) score for CVE-2026-20012
EPSS (Exploit Prediction Scoring System): EPSS predicts the likelihood that a vulnerability will be exploited in the wild. A higher percentage means a greater chance of an exploit occurring. The EPSS model produces a probability score between 0 and 1 (0 and 100%).
0.35 Probability of exploitation activity being observed over the next 30 days (29th percentile)
CVSS score for CVE-2026-20012
CVSS (Common Vulnerability Scoring System): An open framework owned and managed by FIRST.Org, Inc. that assigns a numerical score from 0 to 10 to software vulnerabilities to indicate their severity.
8.6 High
Products affected by CVE-2026-20012
IOS 15.4\(2\)t3
IOS 15.5\(1\)t
IOS 15.6\(2\)s1
IOS 15.6\(2\)sp8
IOS 15.6\(3\)m1
DVE Score by Bitsight AI
DVE scores complement traditional static scoring systems like CVSS with Bitsight AI powered real-time threat intelligence and underground cyber criminal activity so that security teams can reduce alert fatigue and focus on vulnerabilities most likely to be exploited.
Low
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CVE-2026-20012 Global Footprint

Top 10 Identified Countries

Country Observations Percentage
RU 29 14.22%
US 15 7.35%
TH 13 6.37%
EG 10 4.90%
IT 8 3.92%
BR 8 3.92%
KR 7 3.43%
JP 6 2.94%
MX 6 2.94%
IN 6 2.94%

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CVE-2026-20012 Industry Footprint

Top 10 Identified Industries

*Service provider organizations (typically Technology and Telecommunications) are disproportionally represented in the results given their upstream ownership of end-user infrastructure. See our FAQs.

Industry* Observations Percentage
Telecommunications 92 86.79%
Technology 10 9.43%
Finance 2 1.89%
Energy/Resources 1 0.94%
Utilities 1 0.94%

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