CVE-2021-21484Network attack vector

Unauthenticated database access via permissive LDAP bind

Published Mar 9, 2021 · Updated Aug 3, 2024

Authentication bypass in SAP HANA 2.0 allows remote attackers to access database accounts when LDAP permits unauthenticated bind. The LDAP authentication flow accepts a directory server's successful unauthenticated-bind result as proof of the submitted identity. Exploitation requires LDAP authentication and a directory that allows unauthenticated bind; resulting database access is limited by the mapped account's privileges.

CVSS severity7.7
High
EPSS probability1.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in SAP HANA 2.0 allows remote attackers to access database accounts when LDAP permits unauthenticated bind. The LDAP authentication flow accepts a directory server's successful unauthenticated-bind result as proof of the submitted identity. Exploitation requires LDAP authentication and a directory that allows unauthenticated bind; resulting database access is limited by the mapped account's privileges.

The record

CVE
CVE-2021-21484
Published
Mar 9, 2021
Updated
Aug 3, 2024
Vendor
SAP SE
Product
SAP HANA
Classifications
CWE-863, T1078
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 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=< 2.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SAP SE · SAP HANAversion=< 2.0

Published CVSS scores

7.7SAP SECVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/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.

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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-863Incorrect Authorization
T1078Valid Accounts

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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