CVE-2021-27630Network attack vector

Unauthenticated service crash via null pointer dereference

Published Jun 9, 2021 · Updated Aug 3, 2024

NULL pointer dereference in affected SAP NetWeaver AS ABAP Enqueue Server kernels allows remote attackers to crash the service with a crafted packet. EnqConvUniToSrvReq calculates the size of part of an incoming message while a register points to attacker-controlled packet content, then dereferences a null pointer. No authentication or system knowledge is required; the crash prevents the single mandatory Enqueue Server from maintaining the lock service, while data remains unreadable and unmodified.

CVSS severity7.5
High
EPSS probability1.51%
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 affected SAP NetWeaver AS ABAP Enqueue Server kernels allows remote attackers to crash the service with a crafted packet. EnqConvUniToSrvReq calculates the size of part of an incoming message while a register points to attacker-controlled packet content, then dereferences a null pointer. No authentication or system knowledge is required; the crash prevents the single mandatory Enqueue Server from maintaining the lock service, while data remains unreadable and unmodified.

The record

CVE
CVE-2021-27630
Published
Jun 9, 2021
Updated
Aug 3, 2024
Vendor
SAP SE
Product
SAP NetWeaver AS ABAP
Classifications
CWE-476, 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

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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=< 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=< 8.04
  7. Affected versionversion=< KERNEL - 7.22
  8. Affected versionversion=< KRNL32NUC - 7.22
  9. Affected versionversion=< KRNL64NUC - 7.22
  10. Affected versionversion=< KRNL64UC - 8.04

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SAP SE · SAP NetWeaver AS ABAPversion=< 7.22; version=< 7.22EXT; version=< 7.49; version=< 7.53; version=< 7.73; version=< 8.04; version=< KERNEL - 7.22; version=< KRNL32NUC - 7.22; version=< KRNL64NUC - 7.22; version=< KRNL64UC - 8.04

Published CVSS scores

7.5SAP SECVSS: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 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-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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