CVE-2020-6958Public exploitNetwork attack vector

File disclosure via external entities in JNLP parsing

Published Jan 13, 2020 · Updated Aug 4, 2024

XXE in YAJSW JnlpSupport 12.14 allows attackers to read host files and trigger outbound requests via a crafted JNLP configuration. The parseJnlp function creates a DocumentBuilderFactory and parses the supplied stream without disabling external entity resolution. Exploitation requires a service to load an attacker-controlled JNLP configuration; successful parsing can exfiltrate readable files or exhaust resources until the service fails.

CVSS severity9.1
Critical
EPSS probability2.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

XXE in YAJSW JnlpSupport 12.14 allows attackers to read host files and trigger outbound requests via a crafted JNLP configuration. The parseJnlp function creates a DocumentBuilderFactory and parses the supplied stream without disabling external entity resolution. Exploitation requires a service to load an attacker-controlled JNLP configuration; successful parsing can exfiltrate readable files or exhaust resources until the service fails.

The record

CVE
CVE-2020-6958
Published
Jan 13, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-611, T1499, T1005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 13, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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?

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

6.4NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:P
9.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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.

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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-611Improper Restriction of XML External Entity Reference
T1499Endpoint Denial of Service
T1005Data from Local System

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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