Alerts

Security advisories, patches, and warnings

CISA Silently Updated Ransomware Intelligence on 59 Vulnerabilities in 2025 Without Notifying Defenders

Alerts

CISA Silently Updated Ransomware Intelligence on 59 Vulnerabilities in 2025 Without Notifying Defenders

CISA has been silently updating its Known Exploited Vulnerabilities (KEV) catalog when it confirms that vulnerabilities are being exploited by ransomware groups — without notifying defenders when those changes occur. Glenn Thorpe, senior director of security research and detection engineering at GreyNoise, documented the gap by downloading daily KEV snapshots for

By Zero Day Wire
APT28 Weaponizes Microsoft Office Zero-Day Within 24 Hours, Targets Ukraine and EU with Covenant Backdoor

Alerts

APT28 Weaponizes Microsoft Office Zero-Day Within 24 Hours, Targets Ukraine and EU with Covenant Backdoor

Russian state-sponsored hacking group APT28 weaponized a critical Microsoft Office zero-day vulnerability within 24 hours of public disclosure, launching targeted attacks against Ukrainian government agencies and European Union institutions. Ukraine's Computer Emergency Response Team (CERT-UA) detected exploitation attempts beginning January 27 — just one day after Microsoft published details

By Zero Day Wire
OpenSSL Patches High-Severity Stack Buffer Overflow and Eleven Additional Vulnerabilities

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OpenSSL Patches High-Severity Stack Buffer Overflow and Eleven Additional Vulnerabilities

The OpenSSL project has released a sweeping security update addressing twelve vulnerabilities across the widely-used cryptographic library, including a high-severity stack buffer overflow that could potentially enable remote code execution on vulnerable systems. The headline flaw, tracked as CVE-2025-15467, affects CMS AuthEnvelopedData parsing and carries high severity. Organizations running OpenSSL

By Zero Day Wire
Critical Fortinet Authentication Bypass Allows Access to Other Customers' Devices (CVE-2026-24858)

Alerts

Critical Fortinet Authentication Bypass Allows Access to Other Customers' Devices (CVE-2026-24858)

Fortinet has disclosed a critical authentication bypass vulnerability affecting FortiOS, FortiManager, and FortiAnalyzer that allows attackers with a FortiCloud account to access devices registered to other customers' accounts. The vulnerability has been added to CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild. The flaw,

By Zero Day Wire