CVE-2017-9233

7.5 HIGH 9% exploit odds Fix listed Denial of service Library

What it is

XML External Entity vulnerability in libexpat 2.2.0 and earlier (Expat XML Parser Library) allows attackers to put the parser in an infinite loop using a malformed external entity definition from an external DTD.

At a glance

Exploitability: Can be exploited over the network without logging in. High risk of service disruption.
Exploit odds: 8.7% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2017-07-25 20:29 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-10-08 21:17 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 8.7% in the next 30 days (EPSS).
Severity: 7.5 HIGH (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2017-07-25 20:29 UTC
Last modified: 2026-10-08 21:17 UTC
Exploit probability: 8.7% · EPSS, next 30 days
Weakness: CWE-611 · XML external entity
Record status: Modified

Affected

Libexpat Project Libexpat ≤ 2.2.0
Python < 2.7.15
Python < 3.3.7
Python < 3.4.7
Python < 3.5.4
Python < 3.6.2
Debian Linux 8.0
Debian Linux 9.0

Attack profile CVSS 3.1 · 7.5

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: High

Raw vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Is it in your code?

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Fix and advisories

References

NVD record · CVE.org record