CVE-2021-20354

Name: CVE-2021-20354
Creator: NVD / NIST
Published: 2021-02-18T15:15:14.343+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 3.70%

Last modified Jun 17, 2026

CVE-2021-20354 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. IBM WebSphere Application Server 8.0, 8.5, and 9.0 could allow a remote attacker to traverse directories. An attacker could send a specially-crafted URL request containing "dot dot" sequences (/../) to view arbitrary files on the system. EPSS estimates a 3.70% chance of exploitation in the next 30 days.

Description

IBM WebSphere Application Server 8.0, 8.5, and 9.0 could allow a remote attacker to traverse directories. An attacker could send a specially-crafted URL request containing "dot dot" sequences (/../) to view arbitrary files on the system. IBM X-Force ID: 194883.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS Probability

3.70%

88.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-22

Affected Software

Vendor	Product	Versions
Ibm	Websphere Application Server	>= 8.0.0.0, <= 8.0.0.15
Ibm	Websphere Application Server	>= 8.5.0.0, <= 8.5.5.19
Ibm	Websphere Application Server	>= 9.0.0.0, <= 9.0.5.6

References

https://exchange.xforce.ibmcloud.com/vulnerabilities/194883VDB Entry, Vendor Advisory
https://www.ibm.com/support/pages/node/6415959Patch, Vendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/194883VDB Entry, Vendor Advisory
https://www.ibm.com/support/pages/node/6415959Patch, Vendor Advisory

Timeline

Published: Feb 18, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-20354?

How severe is CVE-2021-20354?

CVE-2021-20354 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 3.70% probability of exploitation in the next 30 days.

How do I fix CVE-2021-20354?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-20354?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST