CVE-2021-38177Network attack vector

Application crash via malformed HTTP cookie

Published Sep 14, 2021 · Updated Aug 4, 2024

Null pointer dereference in SAP CommonCryptoLib 8.5.38 and earlier allows remote attackers to crash SAP applications with crafted HTTP requests. The secssf_SsfVerifyEx() routine mishandles malicious cookie data and dereferences a null pointer during request processing. No authentication or user interaction is required, and successful exploitation interrupts the affected application without reading or modifying data.

CVSS severity7.5
High
EPSS probability3.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Null pointer dereference in SAP CommonCryptoLib 8.5.38 and earlier allows remote attackers to crash SAP applications with crafted HTTP requests. The secssf_SsfVerifyEx() routine mishandles malicious cookie data and dereferences a null pointer during request processing. No authentication or user interaction is required, and successful exploitation interrupts the affected application without reading or modifying data.

The record

CVE
CVE-2021-38177
Published
Sep 14, 2021
Updated
Aug 4, 2024
Vendor
SAP SE
Product
SAP CommonCryptoLib
Classifications
CWE-476, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 14, 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?

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

  1. Affected versionversion=< 8.5.38 or lower

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SAP SE · SAP CommonCryptoLibversion=< 8.5.38 or lower

Published CVSS scores

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
7.5SAP SECVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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-476NULL Pointer Dereference
T1499.004Application or System Exploitation

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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