CVE-2021-21479Public exploitNetwork attack vector

Unauthenticated code execution via Java EL interpolation

Published Feb 9, 2021 · Updated Aug 3, 2024

Server-side template injection in SAP SE SCIMono before 0.0.19 allows remote attackers to execute arbitrary code via crafted schema IDs. SchemaIdValidator includes an attacker-controlled schema ID in a constraint-violation template that Java Bean Validation evaluates as an EL expression. An unauthenticated request to the SCIM Schemas endpoint is sufficient when bean validation is enabled, permitting commands in the server process context.

CVSS severity8.1
High
EPSS probability10.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Server-side template injection in SAP SE SCIMono before 0.0.19 allows remote attackers to execute arbitrary code via crafted schema IDs. SchemaIdValidator includes an attacker-controlled schema ID in a constraint-violation template that Java Bean Validation evaluates as an EL expression. An unauthenticated request to the SCIM Schemas endpoint is sufficient when bean validation is enabled, permitting commands in the server process context.

The record

CVE
CVE-2021-21479
Published
Feb 9, 2021
Updated
Aug 3, 2024
Vendor
SAP SE
Product
SCIMono
Classifications
CWE-74, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 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=< 0.0.19

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SAP SE · SCIMonoversion=< 0.0.19

Published CVSS scores

9.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
8.1SAP SECVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/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 exploitPublished

Weakness, pattern, technique

CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
T1190Exploit Public-Facing Application

Public exploit references

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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