Hue Bridge: Reusing a Nonce, Key Pair in Encryption
CVE-2026-3559 is a high-severity reusing a nonce, key pair in encryption vulnerability in Hue Bridge from Philips, with a CVSS 3.0 base score of 8.1 out of 10. It can be exploited from the same local network by an unauthenticated attacker, without any action from a user. Affected Hue Bridge versions: 1.73.1973146020. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.54% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Hue Bridge V2 Firmware to 1975170000 or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Philips | Hue Bridge | 1.73.1973146020 | Not stated |
| Philips | Hue Bridge V2 Firmware | before 1975170000 | 1975170000 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- AdjacentThe attacker must be on the same local network segment.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- NoneAvailability is not affected.
Vector: CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N. Scored by CNA (trendmicro.com).
Official description
Philips Hue Bridge HomeKit Accessory Protocol Static Nonce Authentication Bypass Vulnerability. This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of Philips Hue Bridge. Authentication is not required to exploit this vulnerability. The specific flaw exists within the configuration of the SRP authentication mechanism in the HomeKit Accessory Protocol service, which listens on TCP port 8080 by default. The issue results from the use of a static nonce value. An attacker can leverage this vulnerability to bypass authentication on the system. Was ZDI-CAN-28451.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Reusing a Nonce, Key Pair in Encryption
Nonces should be used for the present occasion and only once.
How developers prevent this class of flaw
- Use techniques such as requiring incrementing, time based and/or challenge response to assure uniqueness of nonces.
More Reusing a Nonce, Key Pair in Encryption vulnerabilities (CWE-323)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Third-party and government advisories
- zerodayinitiative.com/advisories/ZDI-26-157/Third Party Advisory
Other vulnerabilities in Hue Bridge
- 8.8 High severity
- 8.0 High severity
- 8.8 High severity
- 8.1 High severity
- 8.0 High severity
- 8.8 High severity
Recent Reusing a Nonce, Key Pair in Encryption vulnerabilities
- 7.3 High severity
- 7.5 High severity
- 9.8 Critical severity
- 9.1 Critical severity
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