Denial of service via recursive entity expansion
Published Jun 30, 2021 · Updated Aug 3, 2024
XML entity expansion in Sprint Mc XML2Dict 0.2.2 allows remote attackers to cause a service interruption via crafted XML. The parse function accepts recursive entity references in a document type definition and expands them without limits, exhausting processor time or memory. An application must pass attacker-controlled XML into the library; the demonstrated consequence is loss of availability rather than data access or modification.
Summary
What happened
XML entity expansion in Sprint Mc XML2Dict 0.2.2 allows remote attackers to cause a service interruption via crafted XML. The parse function accepts recursive entity references in a document type definition and expands them without limits, exhausting processor time or memory. An application must pass attacker-controlled XML into the library; the demonstrated consequence is loss of availability rather than data access or modification.
The record
- CVE
- CVE-2021-25951
- Published
- Jun 30, 2021
- Updated
- Aug 3, 2024
- Vendor
- Sprint Mc
- Product
- XML2Dict
- Classifications
- CWE-611, CWE-776, T1499.002
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 30, 2021CVE publishedPublication date reported by the CVE source.
- 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.
- Affected versionversion=0.2.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
- Snyk recursive entity expansion proof of conceptproof of concept · unverified
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Technologies
Your stack
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Your stack
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