CVE-2021-20517

HIGH 8.8CVE-2021-20517 · Published 07/06/2021 · updated 17/06/2026

In short

CVE-2021-20517 is a HIGH (CVSS 8.8) vulnerability affecting websphere application server nd (ibm).
Chance of exploitation in the next 30 days (EPSS): 1.9%, higher than 79.4% of all vulnerabilities.
Fix: update to 8.5.5.20, 9.0.5.8 or later.

Package	Affected versions	Patched versions
websphere application server nd ibm	`≥ 8.5.0.0, < 8.5.5.20≥ 9.0.0.0, < 9.0.5.8`	`8.5.5.209.0.5.8`

Description

IBM WebSphere Application Server Network Deployment 8.5 and 9.0 could allow a remote authenticated attacker to traverse directories. An attacker could send a specially-crafted URL request containing "dot dot" sequences (/../) to read and delete arbitrary files on the system. IBM X-Force ID: 198435.

References

exchange.xforce.ibmcloud.com/vulnerabilities/198435 · VDB Entry
ibm.com/support/pages/node/6456955 · Patch

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