CVE-2018-20843

high
New! CVE Severity Now Using CVSS v3

The calculated severity for CVEs has been updated to use CVSS v3 by default. CVEs that do not have a CVSS v3 score will fall back CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

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).

References

https://github.com/libexpat/libexpat/issues/186

https://github.com/libexpat/libexpat/pull/262

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5226

https://github.com/libexpat/libexpat/pull/262/commits/11f8838bf99ea0a6f0b76f9760c43704d00c4ff6

https://github.com/libexpat/libexpat/blob/R_2_2_7/expat/Changes

https://usn.ubuntu.com/4040-1/

https://usn.ubuntu.com/4040-2/

https://seclists.org/bugtraq/2019/Jun/39

https://www.debian.org/security/2019/dsa-4472

https://lists.debian.org/debian-lts-announce/2019/06/msg00028.html

https://security.netapp.com/advisory/ntap-20190703-0001/

https://lists.fedoraproject.org/archives/list/[email protected]/message/CEJJSQSG3KSUQY4FPVHZ7ZTT7FORMFVD/

https://lists.fedoraproject.org/archives/list/[email protected]/message/IDAUGEB3TUP6NEKJDBUBZX7N5OAUOOOK/

https://support.f5.com/csp/article/K51011533

http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00039.html

https://security.gentoo.org/glsa/201911-08

https://www.oracle.com/security-alerts/cpuapr2020.html

https://www.oracle.com/security-alerts/cpuoct2020.html

https://www.oracle.com/security-alerts/cpuApr2021.html

https://www.tenable.com/security/tns-2021-11

https://www.oracle.com/security-alerts/cpuoct2021.html

Details

Source: MITRE

Published: 2019-06-24

Updated: 2021-10-20

Type: CWE-611

Risk Information

CVSS v2

Base Score: 7.8

Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C

Impact Score: 6.9

Exploitability Score: 10

Severity: HIGH

CVSS v3

Base Score: 7.5

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

Impact Score: 3.6

Exploitability Score: 3.9

Severity: HIGH

Tenable Plugins

View all (36 total)

IDNameProductFamilySeverity
154497NewStart CGSL CORE 5.05 / MAIN 5.05 : expat Multiple Vulnerabilities (NS-SA-2021-0175)NessusNewStart CGSL Local Security Checks
high
154340Oracle HTTP Server (Oct 2021 CPU)NessusWeb Servers
medium
150798Tenable Nessus 8.x.x < 8.15.0 Multiple Vulnerabilities (TNS-2021-11)NessusMisc.
medium
147315NewStart CGSL MAIN 6.02 : expat Multiple Vulnerabilities (NS-SA-2021-0083)NessusNewStart CGSL Local Security Checks
high
147278NewStart CGSL CORE 5.04 / MAIN 5.04 : expat Multiple Vulnerabilities (NS-SA-2021-0026)NessusNewStart CGSL Local Security Checks
high
146038CentOS 8 : expat (CESA-2020:4484)NessusCentOS Local Security Checks
high
145988CentOS 8 : mingw-expat (CESA-2020:4846)NessusCentOS Local Security Checks
high
144990Amazon Linux AMI : expat (ALAS-2021-1459)NessusAmazon Linux Local Security Checks
high
144775IBM HTTP Server 7.0.0.0 <= 7.0.0.45 / 8.0.0.0 <= 8.0.0.15 / 8.5.0.0 < 8.5.5.17 / 9.0.0.0 < 9.0.5.1 Multiple Vulnerabilities (964768)NessusWeb Servers
medium
144463Amazon Linux AMI : expat (ALAS-2020-1460) (deprecated)NessusAmazon Linux Local Security Checks
high
143071RHEL 8 : expat (RHSA-2020:4484)NessusRed Hat Local Security Checks
high
142796Oracle Linux 8 : expat (ELSA-2020-4484)NessusOracle Linux Local Security Checks
high
142406RHEL 8 : mingw-expat (RHSA-2020:4846)NessusRed Hat Local Security Checks
high
141963Amazon Linux 2 : expat (ALAS-2020-1513)NessusAmazon Linux Local Security Checks
high
141698Scientific Linux Security Update : expat on SL7.x x86_64 (20201001)NessusScientific Linux Local Security Checks
high
141594CentOS 7 : expat (CESA-2020:3952)NessusCentOS Local Security Checks
high
141223Oracle Linux 7 : expat (ELSA-2020-3952)NessusOracle Linux Local Security Checks
high
141017RHEL 7 : expat (RHSA-2020:3952)NessusRed Hat Local Security Checks
high
137705RHEL 6 / 7 : Red Hat JBoss Core Services Apache HTTP Server 2.4.37 SP3 (RHSA-2020:2644)NessusRed Hat Local Security Checks
medium
131268GLSA-201911-08 : Expat: Multiple vulnerabilitiesNessusGentoo Local Security Checks
high
129256EulerOS 2.0 SP3 : expat (EulerOS-SA-2019-2063)NessusHuawei Local Security Checks
high
128938EulerOS Virtualization for ARM 64 3.0.2.0 : expat (EulerOS-SA-2019-1935)NessusHuawei Local Security Checks
high
128893EulerOS 2.0 SP2 : expat (EulerOS-SA-2019-1841)NessusHuawei Local Security Checks
high
128730Photon OS 3.0: Expat PHSA-2019-3.0-0026NessusPhotonOS Local Security Checks
high
128715Photon OS 2.0: Expat PHSA-2019-2.0-0171NessusPhotonOS Local Security Checks
high
128163Photon OS 1.0: Expat PHSA-2019-1.0-0247NessusPhotonOS Local Security Checks
high
127020EulerOS 2.0 SP8 : expat (EulerOS-SA-2019-1783)NessusHuawei Local Security Checks
high
126934EulerOS 2.0 SP5 : expat (EulerOS-SA-2019-1758)NessusHuawei Local Security Checks
high
126907openSUSE Security Update : expat (openSUSE-2019-1777)NessusSuSE Local Security Checks
high
126706Fedora 29 : expat (2019-139fcda84d)NessusFedora Local Security Checks
high
126696SUSE SLED15 / SLES15 Security Update : expat (SUSE-SU-2019:1835-1)NessusSuSE Local Security Checks
high
126695SUSE SLED12 / SLES12 Security Update : expat (SUSE-SU-2019:1834-1)NessusSuSE Local Security Checks
high
126591Fedora 30 : expat (2019-18868e1715)NessusFedora Local Security Checks
high
126351Debian DSA-4472-1 : expat - security updateNessusDebian Local Security Checks
high
126348Debian DLA-1839-1 : expat security updateNessusDebian Local Security Checks
high
126306Ubuntu 16.04 LTS / 18.04 LTS / 18.10 / 19.04 : Expat vulnerability (USN-4040-1)NessusUbuntu Local Security Checks
high