CVE-2021-20453

mediumpriority · track · 34EPSS 0.025 · 84 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

2.46% (84th) EPSS

CVSS 6.4 · medium

Is it mine?

6 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · nvd

EPSS · scored 2026-10-27

IBM WebSphere Application Server 8.0, 8.5, and 9.0 is vulnerable to a XML External Entity Injection (XXE) attack when processing XML data. A remote attacker could exploit this vulnerability to expose sensitive information or consume memory resources. IBM X-Force ID: 196648.

cvss

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

8.2

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.4–8.2

v2.06.4mediumAV:N/AC:L/Au:N/C:P/I:N/A:Pprimary · NVD / NIST USexploitability 10 · impact 4.9

v3.18.2highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Lprimary · NVD / NIST USexploitability 3.9 · impact 4.2

v3.08.2highCVSS:3.0/S:U/PR:N/UI:N/AC:L/I:N/C:H/A:L/AV:N/RC:C/RL:O/E:Usecondary · ENISA EU

v3.08.2highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Lsecondary · psirt@us.ibm.com USexploitability 3.9 · impact 4.2

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-611USprimary

affected products (6)

Products and version ranges known to be affected.

IBM WebSphere Application Server≤ 8.5enisa_euvdEU
IBM WebSphere Application Server≤ 8.0enisa_euvdEU
IBM WebSphere Application Server≤ 9.0enisa_euvdEU
ibm websphere application server8.0.0.0 → 8.0.0.15nvdUScpe:2.3:a:ibm:websphere_application_server:*:*:*:*:*:*:*:*
ibm websphere application server8.5.0.0 → 8.5.5.20nvdUScpe:2.3:a:ibm:websphere_application_server:*:*:*:*:*:*:*:*
ibm websphere application server9.0.0.0 → 9.0.5.8nvdUScpe:2.3:a:ibm:websphere_application_server:*:*:*:*:*:*:*:*

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 2021-04-20modified 2026-06-17

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+1515 more

references (14)

External citations — patches, advisories, analysis.

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