Yealink MeetingBar A30 Diagnostic command injection

published 2026-02-02 9 mo ago modified 2026-06-17 4 mo ago also EUVD-2026-5110

cvss: 4.3; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 1.3%; EPSS 1.3% chance of exploitation in 30 days, percentile 71%
public exploits: 0; none known

A weakness has been identified in Yealink MeetingBar A30 133.321.0.3. This issue affects some unknown processing of the component Diagnostic Handler. This manipulation causes command injection. It is feasible to perform the attack on the physical device. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

CISA SSVC

Exploitation: Proof of concept is public
Automatable: no
Technical impact: partial
Assessed: 9 mo ago (2026-02-02)

Exploit prediction

1.34% chance of exploitation in the next 30 days, higher than 71% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

drive.google.com https://drive.google.com/file/d/1Uf46ihr8UmeXsFfkcvAeOtF1TkvGjozy/view?usp=sharing referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	4.0	2.4	CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
CNA	3.1	4.3	CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
CNA	3.0	4.3	CVSS:3.0/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
CNA	2.0	4.6	AV:L/AC:L/Au:N/C:P/I:P/A:P/E:POC/RL:ND/RC:UR
CNA	4.0	0.9	CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CNA	3.1	4.3	CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
CNA	2.0	4.6	AV:L/AC:L/Au:N/C:P/I:P/A:P

Affected products

Yealink MeetingBar A30

Classification

Weakness

CWE-77 Improper Neutralization of Special Elements used in a Command
CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component

References

drive.google.com /file/d/1Uf46ihr8UmeXsFfkcvAeOtF1TkvGjozy/view?usp=sharing
exploit
vuldb.com /?id.343634
vdb-entry
vuldb.com /?ctiid.343634
signature, permissions-required
vuldb.com /?submit.736622
third-party-advisory

Sources

CVE List CVE-2026-1735
NVD CVE-2026-1735

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary