CVE-2021-20517

mediumpriority · track · 36EPSS 0.019 · 79 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.86% (79th) EPSS

CVSS 6.5 · medium

Is it mine?

4 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · nvd

EPSS · scored 2026-10-28

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.

cvss

Technical severity, 0–10. One row per scoring source.

8.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.4–8.8

v2.06.5mediumAV:N/AC:L/Au:S/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 8 · impact 6.4

v3.18.8highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 2.8 · impact 5.9

v3.06.4mediumCVSS:3.0/UI:N/A:L/C:L/I:H/AV:N/AC:H/S:U/PR:L/RL:O/E:U/RC:Csecondary · ENISA EU

v3.06.4mediumCVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:Lsecondary · psirt@us.ibm.com USexploitability 1.6 · impact 4.7

v3.18.1highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-22USprimary

affected products (4)

Products and version ranges known to be affected.

IBM WebSphere Application Server ND≤ 9.0enisa_euvdEU
IBM WebSphere Application Server ND≤ 8.5enisa_euvdEU
ibm websphere application server nd8.5.0.0 → 8.5.5.20nvdUScpe:2.3:a:ibm:websphere_application_server_nd:*:*:*:*:*:*:*:*
ibm websphere application server nd9.0.0.0 → 9.0.5.8nvdUScpe:2.3:a:ibm:websphere_application_server_nd:*:*:*:*:*:*:*:*

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd NVD CVE.org MITRE

published 2021-06-07modified 2026-06-17

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+12533 more

references (11)

External citations — patches, advisories, analysis.

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