Vulnerability · Published Sep 25, 2025 · Assigned by VulDB

CVE-2025-10948MikroTik RouterOS libjson.so print parse_json_element buffer overflow

High 8.8

In plain English

A high-severity buffer overflow in RouterOS from MikroTik. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 1.0% (higher than 64% of all known vulnerabilities).

Severity (CVSS 3.1)8.8High

Exploit odds (30 days)1.0%top 36.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

A vulnerability has been found in MikroTik RouterOS 7. This affects the function parse_json_element of the file /rest/ip/address/print of the component libjson.so. The manipulation leads to buffer overflow. The attack is possible to be carried out remotely. The exploit has been disclosed to the public and may be used. Upgrading to version 7.20.1 and 7.21beta2 mitigates this issue. You should upgrade the affected component. The vendor replied: "Our bug tracker reports that your issue has been fixed. This means that we plan to release a RouterOS update with this fix. Make sure to upgrade to the next release when it comes out."

Affected products (as reported)

Vendor	Product	Versions
MikroTik	RouterOS	7

Weakness: CWE-120, CWE-119 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C

References

VDB-325818 | MikroTik RouterOS libjson.so print parse_json_element buffer overflow vdb-entry, technical-description
VDB-325818 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
Submit #652387 | MikroTik RouterOS 7 Memory Corruption third-party-advisory
https://github.com/a2ure123/libjson-unicode-buffer-overflow-poc exploit
https://github.com/a2ure123/libjson-unicode-buffer-overflow-poc#technical-proof-of-concept exploit