CVE-2020-10136
IP-in-IP protocol allows a remote, unauthenticated attacker to route arbitrary network traffic
CVE-2020-10136 is a medium vulnerability (CVSS 5.3) in Cisco Nx-os, published June 2, 2020. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 28.5%, the 98th percentile. No source names a fixed version.
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- Low
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2020-10136- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:N/I:N/A:P - Weakness
- CWE-290
- Updated
- 2026-11-02
CVE List No score
IP-in-IP protocol allows a remote, unauthenticated attacker to route arbitrary network traffic
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.
- Record
CVE-2020-10136- Weakness
- CWE-290
- Updated
- 2026-11-02
EUVDEUVD-2020-2599 No score
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.
- Record
EUVD-2020-2599- Updated
- 2026-11-02
GitHub AdvisoriesGHSA-8gxc-83hw-9578
Multiple products that implement the IP Encapsulation within IP standard (RFC 2003, STD 1)...
Multiple products that implement the IP Encapsulation within IP standard (RFC 2003, STD 1) decapsulate and route IP-in-IP traffic without any validation, which could allow an unauthenticated remote attacker to route arbitrary traffic via an exposed network interface and lead to spoofing, access control bypass, and other unexpected network behaviors.
- Record
GHSA-8gxc-83hw-9578- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - Weakness
- CWE-290
- Updated
- 2026-11-02
Affected products
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| PoC in GitHub | PapayaJackal/ipeeyoupeewepee | 2025-01-21 |
History
| When | Changed | Sources |
|---|---|---|
| 2026-11-02 | created | CVE List, EUVD, GitHub Advisories, NVD, PoC in GitHub |