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Vulnerability record · public intelligence
CVE-2020-13943
UNKNOWN

Exposure of Sensitive Information to an Unauthorized Actor in Apache Tomcat

Published Oct 12, 2020 · Updated Nov 3, 2026

Severity · CVSSUNKNOWN · Not scored
Known exploitationNot listed
EPSS / likelihood52.64%
QFinch risk scoreNot available

Original summary

Normalized public record · Updated Nov 3, 2026

Exposure of Sensitive Information to an Unauthorized Actor in Apache Tomcat

Publisher and source text is retained separately from QFinch interpretation.

QFinch assessment

If an HTTP/2 client connecting to Apache Tomcat 10.0.0-M1 to 10.0.0-M7, 9.0.0.M1 to 9.0.37 or 8.5.0 to 8.5.57 exceeded the agreed maximum number of concurrent streams for a connection (in violation of the HTTP/2 protocol), it was possible that a subsequent request made on that connection could contain HTTP headers - including HTTP/2 pseudo headers - from a previous request rather than the intended headers. This could lead to users seeing responses for unexpected resources.

Evidence: public source records

Affected products

Affected scope reported by the available public evidence
Affected package, product or rangeFix status
Consult the referenced vendor advisory for affected versions.Consult source advisory

Matching a version is only one part of assessing exposure. QFinch has not assessed your environment on this public page.

Remediation

Apply the vendor-supported fixed release or mitigation, then verify the affected component is no longer reachable.

  1. Confirm the affected product and reachable code path exist in your environment.
  2. Apply the vendor-supported patch or mitigation from the primary advisory.
  3. Rescan the exact deployed revision and retain verification evidence.
Review primary references

Evidence coverage

FIRST-EPSSCVE-LIST-V5
SSVC priority
LOW
Confidence
Not available
Aliases
None reported

Scores appear only when corresponding evidence exists. Missing data is never interpreted as zero risk.

Sources and record history

  1. lists.apache.org ↗
  2. [debian-lts-announce] 20201014 [SECURITY] [DLA 2407-1] tomcat8 security update ↗
  3. openSUSE-SU-2020:1799 ↗
  4. openSUSE-SU-2020:1842 ↗
  5. DSA-4835 ↗
  6. www.oracle.com ↗
  7. security.netapp.com ↗

Record history

Published Oct 12, 2020 · Last refreshed Nov 3, 2026

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