Denial of Service Vulnerability in Netopeer2 Server by CESNET
CVE-2026-63201

7.1HIGH

Key Information:

Vendor

Cesnet

Status
Netopeer2
Vendor
CVE Published:
30 October 2026

What is CVE-2026-63201?

The Netopeer2 server, used for network configuration management via the NETCONF protocol, is susceptible to a specific denial of service vulnerability. A low-privileged authenticated NETCONF user can exploit this flaw by sending a malformed get RPC request with an invalid subtree filter containing format specifiers. This results in the netopeer2-server crashing, as the flawed request path leads to unsafe handling of the received data. This vulnerability was confirmed in version 2.8.7, and although the possibility of remote code execution was explored, it was not substantiated. Version 2.8.21 has the fixes for this issue, but the status of version 2.8.8 remains unclear due to the lack of a public tag.

Affected Version(s)

netopeer2 < 2.8.21

References

https://github.com/CESNET/netopeer2/security/advisories/G...
x_refsource_CONFIRM
https://github.com/CESNET/netopeer2/commit/e98beb2d4d8cc8...
x_refsource_MISC
https://github.com/CESNET/netopeer2/releases/tag/2.8.21
x_refsource_MISC

CVSS V4

Score:
7.1
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.