CVE-2021-27335

CRITICAL 9.8CVE-2021-27335 · Published 18/02/2021 · updated 17/06/2026

In short

CVE-2021-27335 is a CRITICAL (CVSS 9.8) vulnerability affecting kollect (kollectapp).
Chance of exploitation in the next 30 days (EPSS): 3.0%, higher than 87.4% of all vulnerabilities.
Fix: update to 4.8.16c or later.

Package	Affected versions	Patched versions
kollect kollectapp	`< 4.8.16c`	`4.8.16c`

Description

KollectApps before 4.8.16c is affected by insecure Java deserialization, leading to Remote Code Execution via a ysoserial.payloads.CommonsCollections parameter.

References

hacked0x90.net/index.php/2021/02/15/kollectapp-insecure-java-deserialization · Exploit

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