VulnerabilityPublished 4 Nov 2026

CVE-2026-122124: Yealink UVC40 E2 · Incorrect Resource Transfer Between Spheres

Affects Yealink UVC40 E2Source CVE Database V5

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Not known to be exploited · CVSS 6.1 Medium : upgrade to 319.410.0.71 when convenient.

Data as of 4 Nov 2026, 21:42 UTC

CVSS 3.1 base score

6.1Medium

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

Thin evidence

One scorer or none

CVSS scores by source
CNA (mitre)	CVSS 3.1	6.1

Patch: Available – fixed in 319.410.0.71

CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

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

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

Attack Vector: Physical: The attack requires the attacker to physically touch or manipulate the vulnerable component. Physical interaction may be brief or persistent.
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: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
Integrity: High: There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to 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 4 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: 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 4 Nov 2026.

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.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity 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

Upgrade Yealink UVC40 E2 to 319.410.0.71.

Affected software

Product	Affected	Fixed in
YealinkUVC40 E2	Affected <319.410.0.71	Fixed in 319.410.0.71

AI-suggested

Upgrade Yealink UVC40 E2 devices to firmware version 319.410.0.71 or later, where this vulnerability is fixed. No other mitigation or temporary workaround is indicated.

Description

Yealink UVC40 E2 devices running firmware versions before 319.410.0.71 contain a vulnerability that allows an attacker with brief physical access to extract Wi-Fi credentials via the USB interface. This flaw also enables abuse of sensitive firmware configuration data to escalate privileges to root. An attacker within Wi-Fi range can then perform audio and video eavesdropping without triggering any LED alert on the device.

Impact

An attacker with brief physical access can extract Wi-Fi credentials and escalate privileges to root on the device. This leads to potential unauthorized remote audio and video surveillance without any LED notification, compromising confidentiality and privacy. The vulnerability has a CVSS score of 6.1, indicating a medium severity impact primarily on confidentiality and integrity.

Summary

CVE-2026-122124 is an incorrect resource transfer vulnerability (CWE-669) affecting Yealink UVC40 E2 devices with firmware versions prior to 319.410.0.71. The vulnerability permits an attacker with short-term physical access to steal Wi-Fi credentials through the USB interface. Additionally, sensitive configuration data in the firmware can be exploited to gain root privileges. Once compromised, the attacker can conduct audio and video surveillance within Wi-Fi coverage without any visual indication from the device. The issue is fixed in firmware version 319.410.0.71.

References

yealink.com/en/trust-center/security-bulletins/yealink-uvc40-e2-physical-access-via-usb-interface-allows-extraction-of-sensitive-data-and-root-privilege-acquisition (opens in a new tab)

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 4 Nov 2026, 18:30 UTC

WeaknessesCWE-669

Technical details

References

Community reviews

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