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CVE-2021-27561 is an unauthenticated command injection vulnerability in Yealink Device Management (DM) version 3.6.0.20. The flaw is exposed through the /sm/api/v1/firewall/zone/services URI and allows attacker-supplied input to be interpreted by the underlying operating system. Successful exploitation results in execution of arbitrary system commands with root privileges, without requiring prior authentication. The vulnerability was rapidly incorporated into Mirai-based exploitation activity shortly after public disclosure, indicating that internet-exposed instances were readily targetable for remote compromise.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A remote code execution vulnerability affecting Yealink Device Management, listed as one of the exploit vectors used by the MANGA Mirai variant.
One half of a critical exploit chain affecting Yealink Device Management; it is chained with CVE-2021-27562 to achieve pre-authentication root-level remote code execution.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.