RHSA-2021:0327
Vulnerability from csaf_redhat - Published: 2021-02-01 18:56 - Updated: 2026-11-07 05:26A flaw was found in Keycloak, where it is possible to force the server to call out an unverified URL using the OIDC parameter request_uri. This flaw allows an attacker to use this parameter to execute a Server-side request forgery (SSRF) attack.
| Product | Identifier | Version | Remediation |
|---|---|---|---|
|
Red Hat Single Sign-On 7.4.5
Red Hat / Red Hat Single Sign-On
|
cpe:/a:redhat:red_hat_single_sign_on:7.4
|
— |
Vendor Fix
fix
|
Apache HttpClient versions prior to version 4.5.13 and 5.0.3 can misinterpret malformed authority component in request URIs passed to the library as java.net.URI object and pick the wrong target host for request execution.
A flaw was found in the RESTEasy client in all versions of RESTEasy up to 4.5.6.Final. This flaw allows client users to obtain the server's potentially sensitive information when the server receives the WebApplicationException from the RESTEasy client call. The highest threat from this vulnerability is to confidentiality.
A flaw was found in wildfly. JMS passwords are logged by the resource adaptor in plain text at the warning level when a connection error occurs allowing any user that has access to the log to gain access to this sensitive information. The highest threat from this vulnerability is to data confidentiality.
A memory leak flaw was found in WildFly in all versions up to 21.0.0.Final, where the host-controller tries to reconnect in a loop, generating new connections that are not properly closed while unable to connect to the domain controller. This flaw allows an attacker to cause an Out of memory (OOM) issue, leading to a denial of service. The highest threat from this vulnerability is to system availability.
A flaw was found in the Undertow AJP connector. Malicious requests and abrupt connection closes could be triggered by an attacker using query strings with non-RFC compliant characters resulting in a denial of service. The highest threat from this vulnerability is to system availability.
A flaw was found in Wildfly. When an application uses the OpenTracing API's java-interceptors, there is a possibility of a memory leak. This flaw allows an attacker to impact the availability of the server. The highest threat from this vulnerability is to system availability.
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"date": "2021-02-01T18:56:14+00:00",
"details": "Before applying the update, back up your existing installation, including all applications, configuration files, databases and database settings, and so on.\n\nThe References section of this erratum contains a download link (you must log in to download the update).",
"product_ids": [
"Red Hat Single Sign-On 7.4.5"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2021:0327"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"products": [
"Red Hat Single Sign-On 7.4.5"
]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "wildfly-core: memory leak in WildFly host-controller in domain mode while not able to reconnect to domain-controller"
},
{
"cve": "CVE-2020-27782",
"cwe": {
"id": "CWE-400",
"name": "Uncontrolled Resource Consumption"
},
"discovery_date": "2020-11-24T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1901304"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the Undertow AJP connector. Malicious requests and abrupt connection closes could be triggered by an attacker using query strings with non-RFC compliant characters resulting in a denial of service. The highest threat from this vulnerability is to system availability.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "undertow: special character in query results in server errors",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
"fixed": [
"Red Hat Single Sign-On 7.4.5"
]
},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2020-27782"
},
{
"category": "external",
"summary": "RHBZ#1901304",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1901304"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2020-27782",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-27782"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2020-27782",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-27782"
}
],
"release_date": "2021-01-25T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2021-02-01T18:56:14+00:00",
"details": "Before applying the update, back up your existing installation, including all applications, configuration files, databases and database settings, and so on.\n\nThe References section of this erratum contains a download link (you must log in to download the update).",
"product_ids": [
"Red Hat Single Sign-On 7.4.5"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2021:0327"
},
{
"category": "workaround",
"details": "The issue can be mitigated by using HTTP/1.1 instead of AJP to proxy to the back-end.",
"product_ids": [
"Red Hat Single Sign-On 7.4.5"
]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"products": [
"Red Hat Single Sign-On 7.4.5"
]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "undertow: special character in query results in server errors"
},
{
"cve": "CVE-2020-27822",
"cwe": {
"id": "CWE-401",
"name": "Missing Release of Memory after Effective Lifetime"
},
"discovery_date": "2020-12-03T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1904060"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in Wildfly. When an application uses the OpenTracing API\u0027s java-interceptors, there is a possibility of a memory leak. This flaw allows an attacker to impact the availability of the server. The highest threat from this vulnerability is to system availability.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "wildfly: Potential Memory leak in Wildfly when using OpenTracing",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
"fixed": [
"Red Hat Single Sign-On 7.4.5"
]
},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2020-27822"
},
{
"category": "external",
"summary": "RHBZ#1904060",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1904060"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2020-27822",
"url": "https://www.cve.org/CVERecord?id=CVE-2020-27822"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2020-27822",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-27822"
},
{
"category": "external",
"summary": "https://issues.redhat.com/browse/WFLY-14094",
"url": "https://issues.redhat.com/browse/WFLY-14094"
}
],
"release_date": "2020-12-04T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2021-02-01T18:56:14+00:00",
"details": "Before applying the update, back up your existing installation, including all applications, configuration files, databases and database settings, and so on.\n\nThe References section of this erratum contains a download link (you must log in to download the update).",
"product_ids": [
"Red Hat Single Sign-On 7.4.5"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2021:0327"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"products": [
"Red Hat Single Sign-On 7.4.5"
]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "wildfly: Potential Memory leak in Wildfly when using OpenTracing"
}
]
}
Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.