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CVE-2018-20843

HIGH
7.5
CVSS Score
Published: June 24, 2019 at 04:06 PM UTC
Updated: October 14, 2026 at 07:16 AM UTC
9 products affected across 7 vendorsDebian LinuxFedoraUbuntu Linux

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Severity
HIGH7.5
Exploit prediction
EPSS 7%
SSVC
No known 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).

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Ubuntu Linux· Canonicalrubygems
95%
12.0414.0416.0418.0418.1019.04
Debian Linux· Debiandrupal
95%
8.09.0
Fedora· Fedora Projectrpm
95%
2930
Libexpat· Libexpat Project
95%
v < 2.2.7
Affected range stops below 2.2.7, so it looks safe — our inference, not a vendor statement
Leap· openSUSEdrupal
95%
15.015.1
Hospitality RES 3700· Oracle
95%
5.7 ≤ v ≤ 5.7.6
HTTP Server· Oracle
95%
12.1.3.012.2.1.4.0
Outside In Technology· Oracle
95%
8.5.48.5.5
Nessus· Tenable Network Security
95%
v < 8.15.0
Affected range stops below 8.15.0, so it looks safe — our inference, not a vendor statement

References (22)

Vendor Advisoryx_refsource_SUSEMailing ListThird Party Advisory
Source: [email protected]
http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00039.html
x_refsource_MISCIssue TrackingThird Party Advisory
Source: [email protected]
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5226
x_refsource_MISCRelease NotesThird Party Advisory
Source: [email protected]
https://github.com/libexpat/libexpat/blob/R_2_2_7/expat/Changes
x_refsource_MISCIssue TrackingPatchThird Party Advisory
Source: [email protected]
https://github.com/libexpat/libexpat/issues/186
x_refsource_MISCExploitPatchThird Party Advisory
Source: [email protected]
https://github.com/libexpat/libexpat/pull/262
x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/libexpat/libexpat/pull/262/commits/11f8838bf99ea0a6f0b76f9760c43704d00c4ff6
Mailing Listx_refsource_MLISTThird Party Advisory
Source: [email protected]
https://lists.debian.org/debian-lts-announce/2019/06/msg00028.html
Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CEJJSQSG3KSUQY4FPVHZ7ZTT7FORMFVD/

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-611

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