Inferred CVEs

Cortex Xpanse identifies
Inferred CVEs
by matching the service version information available to our scanners with CVE information from the NVD.
Common Vulnerabilities and Exposures (CVE) is a system for referencing publicly disclosed software security vulnerabilities. Individual vulnerabilities are commonly referred to as
CVEs
, and each one is uniquely identified by a CVE ID, such as CVE-2020-1234.
Cortex Xpanse attempts to match each service with CVEs that might be present on that service. We refer to any potential matches as
Inferred CVEs
. We perform this matching using the service name and version information that is available to our scanners. We categorize Inferred CVE matches as High, Medium, or Low Confidence based on the version information that is available on the service and from the National Vulnerability Database (NVD).
  • High Confidence
    —Precise version information is available both from the service and from NVD.
  • Medium Confidence
    —Part of the version information from the service matches the NVD entry for the CVE, but the version information from the service has additional characters
  • Low Confidence
    —Either the service or the NVD entry for the CVE does not have sufficient version information to be a higher confidence match.
The table below provides examples of Inferred CVE matches.
Service information available from Xpanse Scan
CVE information available from NVD
Match Result
Details
Apache v 2.4.50
CVE-2021-41773
Affects cpe:2.3:a:apache:http_server:2.4.49:*:*:*:*:*:*:*
No Match
Because the CPE information from NVD indicates a version of Apache that is different than the one we saw in the scan, this does not match.
Apache v 2.4.49
CVE-2021-41773
Affects cpe:2.3:a:apache:http_server:2.4.49:*:*:*:*:*:*:*
High Confidence Match
Because the CPE information from NVD matches the version of Apache indicated from the scan, this is a high confidence match.
Apache v 2.4.49c
CVE-2021-41773
Affects cpe:2.3:a:apache:http_server:2.4.49:*:*:*:*:*:*:*
Medium Confidence Match
Because the version numbers from the service and the NVD information match,
except for the additional character in the version from the service
, this is a medium confidence match.
Apache (no version number detected)
CVE-2021-41773
Affects cpe:2.3:a:apache:http_server:2.4.49:*:*:*:*:*:*:*
Low Confidence Match
Because the CPE information from NVD matches the software name of the service, but we do not have any information on the version, this is a low confidence match.
Apache v 2.4.50
CVE-2022-22719
Affects cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:* (up to and including 2.4.52)
High Confidence Match
Because the CPE information from NVD matches the version of Apache indicated from the scan, this is a high confidence match.
Apache v 2.4.50 (Running on Red Hat Enterprise Linux 6 (RHEL6), which is not affected by this CVE)
CVE-2022-22719
Affects cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:* (up to and including 2.4.52)
High Confidence Match
Because the CPE information from NVD matches the version of apache indicated from the scan, this is a high confidence match.Xpanse cannot determine if mitigating controls are in place or the underlying OS, so this pairing will still generate a high confidence match.
Apache (any version number)
CVE-2012-3526
Affects cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
Low Confidence Match
Because this CVE does not indicate any specific version number, we consider it to be a low confidence match for any version of Apache http_server, regardless of version information.
In general, an Inferred CVE might impact your service, but additional investigation is required to confirm that the CVE is actually present.
Cortex Xpanse is making ongoing improvements to CVE version matching. In general, we aim to err on the side of overmatching, so you don’t miss a vulnerable service in need of patching. If you notice a version that is incorrectly matched or not matched, please contact your CSM and let them know.
Within the Services module of Cortex Xpanse you can Search for a Specific CVE ID and see the list of services the CVE may be impacting. You can also view the list of inferred CVEs that may be impacting a specific service. CVE information does not appear in the Issues module of Cortex Xpanse.

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