CVE-2021-20511

Name: CVE-2021-20511
Creator: NVD / NIST
Published: 2021-07-15T18:15:08.917+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.9/10EPSS 1.89%

Last modified Jun 17, 2026

CVE-2021-20511 is a medium-severity vulnerability rated 4.9/10 on the CVSS scale. IBM Security Verify Access Docker 10.0.0 could allow a remote attacker to traverse directories on the system. An attacker could send a specially-crafted URL request containing "dot dot" sequences (/../) to view arbitrary files on the system. EPSS estimates a 1.89% chance of exploitation in the next 30 days.

Description

IBM Security Verify Access Docker 10.0.0 could allow a remote attacker to traverse directories on the system. An attacker could send a specially-crafted URL request containing "dot dot" sequences (/../) to view arbitrary files on the system. IBM X-Force ID: 198300.

Metrics

CVSS 3.1

4.9/10

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

EPSS Probability

1.89%

76.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-22

Affected Software

Vendor	Product	Versions
Ibm	Security Verify Access	10.0.0

References

https://exchange.xforce.ibmcloud.com/vulnerabilities/198300VDB Entry, Vendor Advisory
https://www.ibm.com/support/pages/node/6471895Patch, Vendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/198300VDB Entry, Vendor Advisory
https://www.ibm.com/support/pages/node/6471895Patch, Vendor Advisory

Timeline

Published: Jul 15, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-20511?

How severe is CVE-2021-20511?

CVE-2021-20511 has a CVSS score of 4.9/10 (MEDIUM severity). The EPSS model estimates a 1.89% probability of exploitation in the next 30 days.

How do I fix CVE-2021-20511?

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-2021-20511?

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

Scan your code now

Source: NVD / NIST