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01 Record

CVE-2020-11993

Apache HTTP Server versions 2.4.20 to 2.4.43 When trace/debug was enabled for the HTTP/2 module and on certain traffic edge patterns, logging statements were made on the wrong connection, causing

UnratedPUBLISHEDCNA: apache
CNA base scoreUnratedNo CNA CVSS vector
View raw JSON

02 Description

Apache HTTP Server versions 2.4.20 to 2.4.43 When trace/debug was enabled for the HTTP/2 module and on certain traffic edge patterns, logging statements were made on the wrong connection, causing

03 Exploitation and scoring

Exploitation
Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
SSVC decision
Not assessed by CISA
EPSS probability
56.44% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 98.9% of scored records. A rank, not a probability.
NVD base score
7.5 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD analysis status
Analyzed. NVD last modified this record on 2026-06-17.
Red Hat severity
Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2020-08-07 15:32Z6 YR AGO
Last updated
2024-08-04 11:48Z2 YR AGO
Reserved
2020-04-21
Assigning CNA
apache
Record state
PUBLISHED
Severity
Not rated by the issuing CNA
CNA CVSS vector
Not published by the issuing CNA
Weaknesses
  • CWE-444Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')Base
  • CWE-400Uncontrolled Resource ConsumptionClass
Data version
5.1
Document digest
d8fb9b495fb9b50dc5f039e035487fb33b86397c54b11e3a355dcd3e606569ba

05 Affected products

VendorProductVersionsPlatforms
n/aApache HTTP Server2.4.20 to 2.4.43—

06 References

07 Fixed in

AlmaLinux 8

  • mod_http2
    Fixed in 1.15.7-3.module_el8.5.0+2609+b30d9eec
  • mod_md
    Fixed

    A version is affected if any line below covers it.

    • Affected before 1:2.0.8-8.module_el8.5.0+2609+b30d9eec
    • Affected before 1:2.0.8-8.module_el8.6.0+2872+fe0ff7aa

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 8

  • mod_http2
    Fixed in 1.15.7-3.module_el8.5.0+2609+b30d9eec
  • mod_md
    Fixed

    A version is affected if any line below covers it.

    • Affected before 1:2.0.8-8.module_el8.5.0+2609+b30d9eec
    • Affected before 1:2.0.8-8.module_el8.6.0+2872+fe0ff7aa

Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

Debian 12

  • apache2
    Fixed in 2.4.46-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

  • apache2
    Fixed in 2.4.46-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

  • apache2
    Fixed in 2.4.46-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 18.04 LTS

  • apache2
    Fixed in 2.4.29-1ubuntu4.14

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 20.04 LTS

  • apache2
    Fixed in 2.4.41-4ubuntu3.1

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.