CVE-2021-40496Network attack vector

Authenticated information disclosure via replayed GET command

Published Oct 12, 2021 · Updated Aug 4, 2024

Improper access control in SAP Internet Communication Framework allows remote authenticated users to disclose protected system details. The login authentication flow accepts a POST form field that causes the command from an initial GET request to execute repeatedly, exposing information otherwise protected by authentication. Network access to the login page and working logon functionality are required; the published impact is limited to disclosure of data such as system details.

CVSS severity4.3
Medium
EPSS probability0.95%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in SAP Internet Communication Framework allows remote authenticated users to disclose protected system details. The login authentication flow accepts a POST form field that causes the command from an initial GET request to execute repeatedly, exposing information otherwise protected by authentication. Network access to the login page and working logon functionality are required; the published impact is limited to disclosure of data such as system details.

The record

CVE
CVE-2021-40496
Published
Oct 12, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-668, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 12, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
4.0NIST NVDAV:N/AC:L/Au:S/C:P/I:N/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.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-668Exposure of Resource to Wrong Sphere
T1190Exploit Public-Facing Application

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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