What’s Vulnerable › Vulnerabilities
CVE-2020-10136: IP-in-IP protocol allows a remote, unauthenticated attacker to route arbitrary network traffic
- Severity: medium (CVSS 5.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 28.5% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2020-06-02 · updated 2026-06-17
- Weakness: CWE-290
Description
IP-in-IP protocol specifies IP Encapsulation within IP standard (RFC 2003, STD 1) that decapsulate and route IP-in-IP traffic is vulnerable to spoofing, access-control bypass and other unexpected behavior due to the lack of validation to verify network packets before decapsulation and routing.
Affected products
- Cisco NX-OS: 5.2(1)sk3(1.1), 5.2(1)sk3(2.1), 5.2(1)sk3(2.1a), 5.2(1)sk3(2.2), 5.2(1)sk3(2.2b), 5.2(1)sm1(5.1) (+247)
- Cisco Ucs Manager: 3.2(3n)a
- Cisco Unified Computing System (Managed): all versions
- Digi Saros: before 8.1.0.1 — fixed in 8.1.0.1
- HP X3220Nr Firmware: before 3.00.11.08 — fixed in 3.00.11.08
- Treck Tcp/Ip: before 6.0.1.67 — fixed in 6.0.1.67
How to fix
Upgrade to a fixed version: Digi Saros 8.1.0.1; HP X3220Nr Firmware 3.00.11.08; Treck Tcp/Ip 6.0.1.67. Check the vendor advisory for mitigations.
References
- https://datatracker.ietf.org/doc/html/rfc6169
- https://kb.cert.org/vuls/id/636397/
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-ipip-dos-kCT9X4
- https://www.digi.com/resources/security
- https://www.kb.cert.org/vuls/id/636397
- https://datatracker.ietf.org/doc/html/rfc6169
- https://kb.cert.org/vuls/id/636397/
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-ipip-dos-kCT9X4
- https://www.digi.com/resources/security
- https://www.kb.cert.org/vuls/id/199397
- https://www.kb.cert.org/vuls/id/636397
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