CVE-2020-3220 json
Cisco IOS XE Software IPsec VPN Denial of Service Vulnerability
published 2020-06-03 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-24491
- cvss
- 6.8
- version 3.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 45%
- public exploits
- 0
- none known
Summary
A vulnerability in the hardware crypto driver of Cisco IOS XE Software for Cisco 4300 Series Integrated Services Routers and Cisco Catalyst 9800-L Wireless Controllers could allow an unauthenticated, remote attacker to disconnect legitimate IPsec VPN sessions to an affected device. The vulnerability is due to insufficient verification of authenticity of received Encapsulating Security Payload (ESP) packets. An attacker could exploit this vulnerability by tampering with ESP cleartext values as a man-in-the-middle.
Patch / fix
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 23 mo ago
Exploit prediction
0.53% chance of exploitation in the next 30 days, higher than 45% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.0 | 6.8 | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H |
| NVD | 3.1 | 6.8 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H |
| NVD | 2.0 | 7.1 | AV:N/AC:M/Au:N/C:N/I:N/A:C |
Affected products
- Cisco Cisco IOS XE Software 16.4.1
Classification
- Weakness
-
- CWE-345 Insufficient Verification of Data Authenticity
- Technology feeds
References
Sources
- CVE List CVE-2020-3220
- NVD CVE-2020-3220
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