CVE-2026-63201
HighCVSS 7.1Exploitation Probability (EPSS)
Low risk38th percentile - higher than 38% of all known CVEs
Summary
In Netopeer2, a low-privileged authenticated NETCONF user can remotely crash netopeer2-server by sending a get RPC with an invalid subtree filter containing format specifiers. In src/log.c the already formatted buffer is passed to np2log() as the format string, causing vsyslog() to interpret attacker-controlled percent sequences. Denial of service was confirmed on version 2.8.7; reliable remote code execution was not confirmed.
Risk Assessment
A low-privileged authenticated NETCONF user can remotely take down the network configuration management server. This may disrupt management of network devices.
Recommendation
Update Netopeer2 to a fixed version (advisory identifies 2.8.8, fix verified in 2.8.21). Restrict NETCONF access to trusted users.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS