Is CVE-2026-30871 actively exploited?

No active exploitation of CVE-2026-30871 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-30871 be exploited remotely?

Yes. CVE-2026-30871 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-30871?

CVE-2026-30871 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2026-30871

CWE-121Published: March 19, 2026· Updated: Mar 24, 2026

9.8

CVSS v3.1

EPSS:0.01%probability of exploitation in 30 daysPercentile:1.6th

Official Description

OpenWrt Project is a Linux operating system targeting embedded devices. In versions prior to 24.10.6 and 25.12.1, the mdns daemon has a Stack-based Buffer Overflow vulnerability in the parse_question function. The issue is triggered by PTR queries for reverse DNS domains (.in-addr.arpa and .ip6.arpa). DNS packets received on UDP port 5353 are expanded by dn_expand into an 8096-byte global buffer (name_buffer), which is then copied via an unbounded strcpy into a fixed 256-byte stack buffer when handling TYPE_PTR queries. The overflow is possible because dn_expand converts non-printable ASCII bytes (e.g., 0x01) into multi-character octal representations (e.g., \001), significantly inflating the expanded name beyond the stack buffer's capacity. A crafted DNS packet can exploit this expansion behavior to overflow the stack buffer, making the vulnerability reachable through normal multicast DNS packet processing. This issue has been fixed in versions 24.10.6 and 25.12.1.

NVD Source

Technical Analysis

CVE-2026-30871 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.