CVE-2020-27178

mediumpriority · track · 30EPSS 0.012 · 69 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.22% (69th) EPSS

CVSS 5 · medium

Is it mine?

11 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · nvd · osv

EPSS · scored 2026-10-28

Apereo CAS 5.3.x before 5.3.16, 6.x before 6.1.7.2, 6.2.x before 6.2.4, and 6.3.x before 6.3.0-RC4 mishandles secret keys with Google Authenticator for multifactor authentication.

cvss

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

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5–7.5

v2.05mediumAV:N/AC:L/Au:N/C:N/I:P/A:Nprimary · NVD / NIST USexploitability 10 · impact 2.9

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:Nsecondary · OSV

v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-287US

affected products (11)

Products and version ranges known to be affected.

n/a n/a≤ n/aenisa_euvdEU
apereo central authentication service5.3.0 → 5.3.16nvdUScpe:2.3:a:apereo:central_authentication_service:*:*:*:*:*:*:*:*
apereo central authentication service6.0.0 → 6.1.7.2nvdUScpe:2.3:a:apereo:central_authentication_service:*:*:*:*:*:*:*:*
apereo central authentication service6.2.0 → 6.2.4nvdUScpe:2.3:a:apereo:central_authentication_service:*:*:*:*:*:*:*:*
apereo central authentication service= 6.3.0nvdUScpe:2.3:a:apereo:central_authentication_service:*:*:*:*:*:*:*:*
Maven org.apereo.cas:cas-server-support-otp-mfa-core5.3.0 → 5.3.16osvUSpkg:maven/org.apereo.cas/cas-server-support-otp-mfa-core
Maven org.apereo.cas:cas-server-support-otp-mfa-core6.0.0 → 6.1.7.2osvUSpkg:maven/org.apereo.cas/cas-server-support-otp-mfa-core
Maven org.apereo.cas:cas-server-support-otp-mfa-core6.2.0 → 6.2.4osvUSpkg:maven/org.apereo.cas/cas-server-support-otp-mfa-core
Maven org.apereo.cas:cas-server-webapp5.3.0 → 5.3.16osvUSpkg:maven/org.apereo.cas/cas-server-webapp
Maven org.apereo.cas:cas-server-webapp6.0.0 → 6.1.7.2osvUSpkg:maven/org.apereo.cas/cas-server-webapp
Maven org.apereo.cas:cas-server-webapp6.2.0 → 6.2.4osvUSpkg:maven/org.apereo.cas/cas-server-webapp

advisories (1)

Vendor and ecosystem advisories describing this.

GHSA-q39c-5vh5-vw2pImproper Authentication in Apereo CAS2021-08-02ghsa · osvUS
Apereo CAS 5.3.x before 5.3.16, 6.x before 6.1.7.2, 6.2.x before 6.2.4, and 6.3.x before 6.3.0-RC4 mishandles secret keys with Google Authenticator for multifactor authentication.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd osv NVD CVE.org MITRE

published 2020-10-16modified 2026-06-17

references (4)

External citations — patches, advisories, analysis.

scry

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