CVE-2018-20843
HIGH · CVSS 7.5EPSS 7.1%EU EUVD
In libexpat in Expat before 2.2.7, XML input including XML names that contain a large number of colons could make the XML parser consume a high amount of RAM and CPU resources while processing (enough to be usable for denial-of-service attacks).
Key facts
- CVSS score
- 7.5 (v3.1)
- Severity
- HIGH
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- Weakness (CWE)
- CWE-611
- EPSS score
- 7.1% (94th percentile)
- In CISA KEV
- No
- In EU EUVD
- Yes (EUVD-2018-13383)
- Published
- June 24, 2019
- NVD last modified
- October 14, 2026
- Status
- Modified
EU Vulnerability Database (EUVD)
This vulnerability is also tracked by ENISA as EUVD-2018-13383 in the EU Vulnerability Database. Last updated in EUVD on October 14, 2026.
View on the EU Vulnerability DatabaseAffected products
- canonical / ubuntu linux
- canonical / ubuntu linux
- canonical / ubuntu linux
- canonical / ubuntu linux
- canonical / ubuntu linux
- canonical / ubuntu linux
- debian / debian linux
- debian / debian linux
- fedoraproject / fedora
- fedoraproject / fedora
- libexpat project / libexpat
- opensuse / leap
- opensuse / leap
- oracle / hospitality res 3700
- oracle / http server
- oracle / http server
- oracle / outside in technology
- oracle / outside in technology
- tenable / nessus
Certified products that may be affected
2 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.
- Nessus Manager 8.11.1 - Tenable, Inc. - Common Criteria CCEVS-VR-VID-11067-2020 - archived
- Tenable SecurityCenter 4.4 (SC) and Components: 3D Tool 2.0.1 Log Correlation Engine 3.6 (LCE), Passive Vulnerability Scanner 3.6 (PVS), Nessus 5.0.1, and xTool 2.1 - Tenable Network Security, Inc. - Common Criteria CCEVS-VR-VID-10443-2012 - archived
References
- http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00039.html(Mailing List, Third Party Advisory)
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5226(Issue Tracking, Third Party Advisory)
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
- https://github.com/libexpat/libexpat/blob/R_2_2_7/expat/Changes(Release Notes, Third Party Advisory)
- https://github.com/libexpat/libexpat/issues/186(Issue Tracking, Patch, Third Party Advisory)
- https://github.com/libexpat/libexpat/pull/262(Exploit, Patch, Third Party Advisory)
- https://github.com/libexpat/libexpat/pull/262/commits/11f8838bf99ea0a6f0b76f9760c43704d00c4ff6(Patch, Third Party Advisory)
- https://lists.debian.org/debian-lts-announce/2019/06/msg00028.html(Mailing List, Third Party Advisory)
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CEJJSQSG3KSUQY4FPVHZ7ZTT7FORMFVD/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IDAUGEB3TUP6NEKJDBUBZX7N5OAUOOOK/
- https://seclists.org/bugtraq/2019/Jun/39(Mailing List, Third Party Advisory)
- https://security.gentoo.org/glsa/201911-08(Third Party Advisory)
- https://security.netapp.com/advisory/ntap-20190703-0001/(Third Party Advisory)
- https://support.f5.com/csp/article/K51011533(Third Party Advisory)
- https://usn.ubuntu.com/4040-1/(Third Party Advisory)
- https://usn.ubuntu.com/4040-2/(Third Party Advisory)
- https://www.debian.org/security/2019/dsa-4472(Third Party Advisory)
- https://www.oracle.com/security-alerts/cpuApr2021.html(Patch, Third Party Advisory)
- https://www.oracle.com/security-alerts/cpuapr2020.html(Patch, Third Party Advisory)
- https://www.oracle.com/security-alerts/cpuoct2020.html(Patch, Third Party Advisory)
- https://www.oracle.com/security-alerts/cpuoct2021.html(Patch, Third Party Advisory)
- https://www.tenable.com/security/tns-2021-11(Third Party Advisory)
Last updated October 15, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS
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