CVE-2021-33950Network attack vector

Server file disclosure via external XML entities

Published Feb 17, 2023 · Updated Mar 18, 2025

XXE injection in OpenKM 6.3.10 allows remote attackers to read sensitive server files through crafted XML documents. XMLTextExtractor creates a SAX XMLReader without disabling external DTD loading or parameter and general external entities, so entity references resolve local resources during text extraction. The attacker must submit XML processed by the text-extraction path; no authentication or user interaction is required, and the disclosed impact is file disclosure only.

CVSS severity7.5
High
EPSS probability0.70%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

XXE injection in OpenKM 6.3.10 allows remote attackers to read sensitive server files through crafted XML documents. XMLTextExtractor creates a SAX XMLReader without disabling external DTD loading or parameter and general external entities, so entity references resolve local resources during text extraction. The attacker must submit XML processed by the text-extraction path; no authentication or user interaction is required, and the disclosed impact is file disclosure only.

The record

CVE
CVE-2021-33950
Published
Feb 17, 2023
Updated
Mar 18, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-611, T1005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 17, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 18, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

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-611Improper Restriction of XML External Entity Reference
T1005Data from Local System

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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