VulnerabilityModified
CVE-2018-20843
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).
HIGH 7.5EPSS 7.11%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (7.11%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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).
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 7.11% probability · 94th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-611
- Affected
- libexpat project/libexpat · canonical/ubuntu linux · debian/debian linux · fedoraproject/fedora · opensuse/leap · oracle/hospitality res 3700 · oracle/http server · oracle/outside in technology · tenable/nessus
- Source
- cve@mitre.org
References
- http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00039.htmlMailing List, Third Party Advisory
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5226Issue Tracking, Third Party Advisory
- https://github.com/libexpat/libexpat/blob/R_2_2_7/expat/ChangesRelease Notes, Third Party Advisory
- https://github.com/libexpat/libexpat/issues/186Issue Tracking, Patch, Third Party Advisory
- https://github.com/libexpat/libexpat/pull/262Exploit, Patch, Third Party Advisory
- https://github.com/libexpat/libexpat/pull/262/commits/11f8838bf99ea0a6f0b76f9760c43704d00c4ff6Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/06/msg00028.htmlMailing 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/39Mailing List, Third Party Advisory
- https://security.gentoo.org/glsa/201911-08Third Party Advisory
- https://security.netapp.com/advisory/ntap-20190703-0001/Third Party Advisory
- https://support.f5.com/csp/article/K51011533Third 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-4472Third Party Advisory
- https://www.oracle.com/security-alerts/cpuApr2021.htmlPatch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpuapr2020.htmlPatch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpuoct2020.htmlPatch, Third Party Advisory
- https://www.oracle.com/security-alerts/cpuoct2021.htmlPatch, Third Party Advisory
- https://www.tenable.com/security/tns-2021-11Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00039.htmlMailing List, Third Party Advisory
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5226Issue Tracking, Third Party Advisory
- https://github.com/libexpat/libexpat/blob/R_2_2_7/expat/ChangesRelease Notes, Third Party Advisory
- https://github.com/libexpat/libexpat/issues/186Issue Tracking, Patch, Third Party Advisory
- https://github.com/libexpat/libexpat/pull/262Exploit, Patch, Third Party Advisory
- https://github.com/libexpat/libexpat/pull/262/commits/11f8838bf99ea0a6f0b76f9760c43704d00c4ff6Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/06/msg00028.htmlMailing 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/
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.