CVE-2020-4896Network attack vector

Cache poisoning via modified request headers

Published Jan 7, 2021 · Updated Sep 16, 2024

Web cache poisoning in IBM Emptoris Sourcing 10.1.0, 10.1.1, and 10.1.3 allows remote attackers to poison cached responses via modified HTTP headers. The flaw is improper validation of HTTP request headers, allowing attacker-controlled header changes to influence content stored or served by the web cache. Exploitation requires network access to the Emptoris Sourcing web interface; poisoned responses can disclose or alter content delivered to subsequent users, with no evidence of direct server takeover.

CVSS severity6.5
Medium
EPSS probability0.81%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Web cache poisoning in IBM Emptoris Sourcing 10.1.0, 10.1.1, and 10.1.3 allows remote attackers to poison cached responses via modified HTTP headers. The flaw is improper validation of HTTP request headers, allowing attacker-controlled header changes to influence content stored or served by the web cache. Exploitation requires network access to the Emptoris Sourcing web interface; poisoned responses can disclose or alter content delivered to subsequent users, with no evidence of direct server takeover.

The record

CVE
CVE-2020-4896
Published
Jan 7, 2021
Updated
Sep 16, 2024
Vendor
IBM
Product
IBM Emptoris Sourcing
Classifications
CWE-20, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 7, 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=10.1.0
  2. Affected versionversion=10.1.1
  3. Affected versionversion=10.1.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

IBM · IBM Emptoris Sourcingversion=10.1.0; version=10.1.1; version=10.1.3

Published CVSS scores

5.7IBMCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C
6.5IBMCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

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.

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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

CWE-20Improper Input Validation
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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