CVE-2020-1758: red hat keycloak
CVSS: 5.9v3.1MediumModified
AliasesGHSA-c597-f74m-jgc2
Published 15-05-2020Last modified 04-08-2024
Vulnerability summary
CVE-2020-1758 is a medium (CVSS 5.9) vulnerability in red hat keycloak. EPSS estimates a 0.93% chance of exploitation in the next 30 days, higher than 59.8% of scored vulnerabilities.
CVSS score
5.9/10
010
Medium · v3.1 (NVD)EPSS score
0.93%
0%100%
Low · +0.02 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 3Timeline
- 15-05-2020PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
A flaw was found in Keycloak in versions before 10.0.0, where it does not perform the TLS hostname verification while sending emails using the SMTP server. This flaw allows an attacker to perform a man-in-the-middle (MITM) attack.
CVSS metrics
4 scores · 3 sources · 2 versionsMedium 5.9Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:NSources3 sources · 5.3–5.9
- CVE.orgCNA5.3MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:NDiffers
- OSV · MavenEcosystem advisory · calculated5.9MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Medium 4.3Preferred score · NVD (NIST)
AV:N/AC:M/Au:N/C:P/I:N/A:NSourcesSingle source
EPSS trend
Probability
0.93%
Chance of exploitation in the next 30 days
Percentile
60%
Versus all other CVEs
30-day change
+0.02 pp
From 0.91% on 18-09-2026
18-09-202618-10-2026
EPSS score0.93%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-297Improper Validation of Certificate with Host MismatchThe product communicates with a host that provides a certificate, but the product does not properly ensure that the certificate is actually associated with that host.
- CWE-295Improper Certificate ValidationThe product does not validate, or incorrectly validates, a certificate.
Affected systems
Org.keycloak1 product
- keycloak-parent< 10.0.0
Red hat1 product
- keycloakkeycloak versions before 10.0.0
3 vendors · 4 products
References
3 links- bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-1758X Refsource CONFIRMWEBIssue TrackingVendor Advisory
