CVE-2024-5256VulnerabilityPublished 6 Jun 2024Updated 1 Aug 2024

CVE-2024-5256: Sonos Era 100 · Integer Underflow (Wrap or Wraparound)

Affects Sonos Era 100Source CVE Database V5

Not known to be exploited · CVSS 4.3 Medium.

Data as of 26 Oct 2026, 06:26 UTC

CVSS 3.0 base score

4.3Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.4% chance of exploitation in 30 days – higher than 35% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Attack Vector: Adjacent
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: Low
Integrity: None
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Adjacent: The vulnerable component is bound to the network stack, but the attack is limited at the protocol level to a logically adjacent topology. This can mean an attack must be launched from the same shared physical (e.g., Bluetooth or IEEE 802.11) or logical (e.g., local IP subnet) network, or from within a secure or otherwise limited administrative domain (e.g., MPLS, secure VPN to an administrative network zone).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the impacted component.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 6 Jun 2024
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-26.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

AI-suggested

To mitigate CVE-2024-5256, organizations should first monitor Sonos communications channels and security advisories for official patches or firmware updates addressing this vulnerability and apply them promptly once available. Until patches are released, network segmentation should be enforced to isolate Sonos Era 100 devices from untrusted or public networks, restricting SMB2 traffic to trusted management or monitoring subnets only. Deploy network-level controls such as firewalls or access control lists to block or limit SMB2 protocol traffic to and from these devices. Conduct regular network traffic monitoring and anomaly detection focused on SMB2 activity to identify potential exploitation attempts. Additionally, consider disabling SMB2 support on the devices if not required for normal operation, or replacing affected devices with models that have updated security postures. Organizations should also review their overall smart device security policies, including device inventory, patch management, and network architecture, to reduce exposure to similar vulnerabilities. Finally, educate users and administrators about the risks of exposing smart home devices to untrusted networks.

Description

Sonos Era 100 SMB2 Message Handling Integer Underflow Information Disclosure Vulnerability. This vulnerability allows network-adjacent attackers to disclose sensitive information on affected installations of Sonos Era 100 smart speakers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of SMB2 messages. The issue results from the lack of proper validation of user-supplied data, which can result in an integer underflow before reading from memory. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of root. Was ZDI-CAN-22336.

Impact

The primary impact of CVE-2024-5256 is the unauthorized disclosure of sensitive information from Sonos Era 100 devices, which could include memory contents that may reveal configuration details, credentials, or other private data. This compromises confidentiality and could facilitate further attacks. Although the vulnerability itself does not directly affect system integrity or availability, its potential to be chained with other vulnerabilities to achieve root-level arbitrary code execution significantly raises the risk profile. Exploitation requires network adjacency but no authentication, meaning attackers on the same local network or connected via compromised network segments can attempt exploitation. Organizations deploying Sonos Era 100 devices in sensitive environments risk exposure of internal data and potential device takeover if combined with other vulnerabilities. The lack of known exploits currently limits immediate widespread impact, but the public disclosure increases the likelihood of future exploit development. The vulnerability may also undermine trust in smart home device security and could be leveraged in targeted attacks against high-value individuals or organizations using these devices.

References

zerodayinitiative.com/advisories/ZDI-24-542/ (opens in a new tab)

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Exploitation evidence

What to do

Description

AI analysisMachine-generated, updated 28 Feb 2026, 00:21 UTC

WeaknessesCWE-191

Technical details

References

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