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CVE-2021-25742 is a high-severity vulnerability in Kubernetes ingress-nginx in which a user with permission to create or update Ingress objects can abuse the custom snippets feature to inject arbitrary NGINX configuration and obtain all secrets in the cluster. The issue is tied to the snippet annotation capability in ingress-nginx; when snippet annotations are allowed, an attacker who can modify Ingress resources can supply malicious configuration that is processed by the controller and used to access sensitive data available to it. The provided advisory specifically states that this can be used to obtain all cluster secrets.
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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.
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A prior ingress-nginx configuration injection vulnerability involving snippet injection, mentioned as historical context.
A previous ingress-nginx snippet injection vulnerability referenced as part of a pattern of configuration injection issues.
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.