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BleepingComputer
CISA sets urgent deadline to fix Cisco flaw exploited in attacks
The Cybersecurity and Infrastructure Security Agency (CISA) has issued a directive for federal agencies to quickly patch a critical vulnerability in Cisco Unified Communications Manager Server, identified as CVE-2026-20230. The agency has recognized this flaw as actively exploited, highlighting its severity. In parallel, another vulnerability affecting PTC software has also been flagged with the same urgent patch deadline. The situation underscores the importance of timely remediation in safeguarding infrastructure against cyber threats.
Act nowConfidence: HighImmediate horizonCybersecurity risk: High
Published 26 Jun 2026, 20:50 UTC1 min read
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Summary
TL;DR
- CISA sets a June 28 deadline for patching critical Cisco vulnerabilities.
- CVE-2026-20230 allows for remote exploitation without authentication.
- Threat detection startup observed active exploitation of the Cisco flaw.
- CISA includes another critical vulnerability affecting PTC products.
- Both vulnerabilities are classified as critical severity.
Interesting facts
- CVE-2026-20230 is a server-side request forgery vulnerability.
- CISA maintains a catalog of Known Exploited Vulnerabilities (KEV).
- Exploitation of these vulnerabilities may involve sophisticated threat actors.