CVE-2021-27634Network attack vector

Unauthenticated service crash via malformed RFC request

Published Jun 9, 2021 · Updated Aug 3, 2024

Improper input validation in SAP NetWeaver AS for ABAP RFC Gateway allows remote attackers to crash the service with a crafted packet. ThCpicDtCreate in disp+work stores an attacker-controlled RFC request as a malicious pendingRequests entry, triggering memory corruption and process failure. No authentication or system knowledge is required, and the reported impact is an availability-only interruption without data access or modification.

CVSS severity7.5
High
EPSS probability1.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in SAP NetWeaver AS for ABAP RFC Gateway allows remote attackers to crash the service with a crafted packet. ThCpicDtCreate in disp+work stores an attacker-controlled RFC request as a malicious pendingRequests entry, triggering memory corruption and process failure. No authentication or system knowledge is required, and the reported impact is an availability-only interruption without data access or modification.

The record

CVE
CVE-2021-27634
Published
Jun 9, 2021
Updated
Aug 3, 2024
Vendor
SAP SE
Product
SAP NetWeaver Application Server for ABAP
Classifications
CWE-787, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 9, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=< 7.22
  2. Affected versionversion=< 7.22EXT
  3. Affected versionversion=< 7.49
  4. Affected versionversion=< 7.53
  5. Affected versionversion=< 7.73
  6. Affected versionversion=< 7.77
  7. Affected versionversion=< 7.81
  8. Affected versionversion=< 7.82
  9. Affected versionversion=< 7.83
  10. Affected versionversion=< 8.04
  11. Affected versionversion=< KERNEL - 7.22
  12. Affected versionversion=< KRNL32NUC - 7.22
  13. Affected versionversion=< KRNL64NUC - 7.22
  14. Affected versionversion=< KRNL64UC - 8.04

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SAP SE · SAP NetWeaver Application Server for ABAPversion=< 7.22; version=< 7.22EXT; version=< 7.49; version=< 7.53; version=< 7.73; version=< 7.77; version=< 7.81; version=< 7.82; version=< 7.83; version=< 8.04; version=< KERNEL - 7.22; version=< KRNL32NUC - 7.22; version=< KRNL64NUC - 7.22; version=< KRNL64UC - 8.04

Published CVSS scores

5.9NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
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.

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

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1499.004Endpoint Denial of Service: Application 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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