CVE-2020-5024Network attack vector

Unauthenticated service hang via SSL handshake

Published Mar 11, 2021 · Updated Sep 16, 2024

Denial of service in IBM Db2 for Linux, UNIX, and Windows 9.7, 10.1, 10.5, 11.1, and 11.5 allows remote attackers to hang the server. The SSL handshake response hangs while processing an unauthenticated connection; IBM has not disclosed the responsible function or protocol operation. Network reachability to the TLS-enabled database service is sufficient, and the documented consequence is loss of service rather than data access or modification.

CVSS severity7.5
High
EPSS probability2.02%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in IBM Db2 for Linux, UNIX, and Windows 9.7, 10.1, 10.5, 11.1, and 11.5 allows remote attackers to hang the server. The SSL handshake response hangs while processing an unauthenticated connection; IBM has not disclosed the responsible function or protocol operation. Network reachability to the TLS-enabled database service is sufficient, and the documented consequence is loss of service rather than data access or modification.

The record

CVE
CVE-2020-5024
Published
Mar 11, 2021
Updated
Sep 16, 2024
Vendor
IBM
Product
IBM Db2 for Linux, UNIX, and Windows
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 11, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.1
  2. Affected versionversion=10.5
  3. Affected versionversion=11.1
  4. Affected versionversion=11.5
  5. Affected versionversion=9.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

IBM · IBM Db2 for Linux, UNIX, and Windowsversion=10.1; version=10.5; version=11.1; version=11.5; version=9.7

Published CVSS scores

7.5IBM CorporationCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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