Cisco’s Zero-Day Chaos: When Bugs Become Uninvited Guests
Chinese-government-linked threat actors are hammering a severe Cisco AsyncOS zero-day vulnerability with a relentless cyberattack campaign. The bug, known as CVE-2025-20393, affects certain configurations of Secure Email Gateway and Secure Email and Web Manager appliances. Cisco is investigating, but there’s no timeline for a fix.
Hot Take:
Buckle up, folks! It’s a Cisco rumble in the cyber jungle, and it looks like the pandas are back in town! This breach is more intense than a Netflix crime drama, but don’t worry, Cisco is on the case… sort of. Like a cat stuck in a tree, they’re waiting for the fire department to come up with a ladder. Meanwhile, they strongly encourage you to follow the breadcrumbs they’ve left in the advisory. Yikes! Let’s just hope they find a way to patch this up before the hackers turn it into a full-blown opera. Cisco, you might need more than just a band-aid for this one!
Key Points:
– The Cisco AsyncOS zero-day vulnerability, CVE-2025-20393, is being exploited by suspected Chinese-government-linked threat actors.
– The vulnerability affects SEG and SEWM appliances with Spam Quarantine enabled and exposed to the internet.
– Attackers have been exploiting this vulnerability since at least late November 2025.
– Cisco has not provided a timeline for a fix but has issued recommendations for mitigating the risks.
– The US Cybersecurity and Infrastructure Security Agency added the bug to its Known Exploited Vulnerabilities catalog.