MEDIUM 6.5 Microsoft ACTIVELY EXPLOITED
CVE-2025-39682
tls: fix handling of zero-length records on the rx_list
Microsoft Security Update 2025-Sep: tls: fix handling of zero-length records on the rx_list
Affected Products
- azl3 kernel 6.6.96.2-1 on Azure Linux 3.0
- azl3 kernel 6.6.96.2-2 on Azure Linux 3.0
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-39682
- https://nvd.nist.gov/vuln/detail/CVE-2025-39682
This medium severity vulnerability with a CVSS score of 6.5 was published on 2025-09-09 via Microsoft. ⚠ This vulnerability is in the CISA Known Exploited Vulnerabilities (KEV) catalog — it is being actively exploited in the wild. Affected: azl3 kernel 6.6.96.2-1 on Azure Linux 3.0, azl3 kernel 6.6.96.2-2 on Azure Linux 3.0.
Risk Timeline
CVE Disclosed2025-09-09 · 374 days ago
CISA KEV — Actively ExploitedU.S. federal agencies required to patch · confirmed threat-actor activity
Remediation Resources
Official Advisory
msrc.microsoft.com/update-guide/vulnerability/CVE-2025-39682NVD / MITRE
nvd.nist.gov/vuln/detail/CVE-2025-39682Related Vulnerabilities
| CVE | Title | Severity | CVSS |
|---|---|---|---|
| CVE-2026-39821 | Invoking failure to reject ASCII-only Punycode-encoded labels in golang.org/x/ne | CRITICAL | 10.0 |
| CVE-2026-42960 | Possible cache poisoning via promiscuous records for the authority section | CRITICAL | 10.0 |
| CVE-2026-46595 | Invoking VerifiedPublicKeyCallback permissions skip enforcement in golang.org/x | CRITICAL | 10.0 |
| CVE-2025-68121 | Unexpected session resumption in crypto/tls | CRITICAL | 10.0 |
| CVE-2026-27211 | Cloud Hypervisor: Host File Exfiltration via QCOW Backing File Abuse | CRITICAL | 10.0 |
| CVE-2026-7374 | Kubevirt: kubevirt virt-handler: privilege escalation and node compromise via sy | CRITICAL | 9.9 |
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