CVE-2021-20517
IBM WebSphere Application Server Network Deployment 8.5 and 9.0 could allow a remote...
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- Low
- Integrity
- High
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
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.
- Record
CVE-2021-20517- CVSS 3.0
- 6.4 Medium
CVSS:3.0/UI:N/A:L/C:L/I:H/AV:N/AC:H/S:U/PR:L/RL:O/E:U/RC:C - Updated
- 2026-11-02
EUVDEUVD-2021-7935
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.
- Record
EUVD-2021-7935- CVSS 3.0
- 6.4 Medium
CVSS:3.0/UI:N/A:L/C:L/I:H/AV:N/AC:H/S:U/PR:L/RL:O/E:U/RC:C - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-fppj-frvc-63q2 No score
IBM WebSphere Application Server Network Deployment 8.5 and 9.0 could allow a remote...
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.
- Record
GHSA-fppj-frvc-63q2- Weakness
- CWE-22
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2021-20517- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - CVSS 3.0
- 6.4 Medium
CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:L - CVSS 2.0
- 6.5 Medium
AV:N/AC:L/Au:S/C:P/I:P/A:P - Weakness
- CWE-22
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| facts | ||
| aliases, published | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-20517 is a medium vulnerability (CVSS 6.4) in Ibm Websphere Application Server Nd, published June 7, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.86%, the 79th percentile. No source names a fixed version.