Is CVE-2026-3557 actively exploited?

No active exploitation of CVE-2026-3557 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-3557 be exploited remotely?

Partially. CVE-2026-3557 requires adjacent network access (same network segment) to exploit.

What is the CVSS score of CVE-2026-3557?

CVE-2026-3557 has a CVSS score of 8.0 (HIGH).

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HIGH

CVE-2026-3557

CWE-122Published: March 16, 2026· Updated: Mar 16, 2026

8.0

CVSS v3.1

EPSS:0.14%probability of exploitation in 30 daysPercentile:33.3th

Official Description

Philips Hue Bridge hap_pair_verify_handler Sub-TLV Parsing Heap-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of Philips Hue Bridge. Although authentication is required to exploit this vulnerability, the existing authentication mechanism can be bypassed.

The specific flaw exists within the hap_pair_verify_handler function of the hk_hap service, which listens on TCP port 8080 by default. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-28337.

NVD Source

Technical Analysis

CVE-2026-3557 requires adjacent network access, limiting remote exploitation but still posing risk in shared or local network environments.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

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 8.0.