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CVE-2026-63201
Netopeer2 is a server for implementing network configuration management based on the NETCONF Protocol. In affected versions, a low-privileged authenticated NETCONF user can remotely crash netopeer2-server by sending a get RPC with an invalid subtree filter whose text contains format specifiers. In src/netconf.c, np2srv_rpc_get_cb() sends the invalid value through ERR() to np2log_printf(), where vsnprintf() first formats the message safely. In src/log.c, that already formatted buffer is subsequently passed to np2log() as the format string itself, causing vsyslog() to interpret attacker-controlled percent sequences and read invalid pointer arguments. The reported denial of service was confirmed on version 2.8.7 using NETCONF-over-SSH and AddressSanitizer; reliable remote code execution was not confirmed. The advisory identifies 2.8.8 as patched; repository comparisons verify the fix in public release 2.8.21. The affected/fixed boundary remains unresolved because no public 2.8.8 tag was located, which does not establish the status of an untagged 2.8.8 build.
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The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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