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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…
High7.5EPSS 7.1%
- Published
- Updated
- Reserved
- Assigned by
- mitre
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).
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| CISA-ADPADP (enrichment) | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Modified | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 7.1% · top 5.7% of all CVEs (5 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Weakness
Affected products
n/a
- affected n/a
References (22)
- USN-4040-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- USN-4040-2 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- DSA-4472 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
- 20190628 [SECURITY] [DSA 4472-1] expat security update (opens in a new tab)mailing-listx_refsource_BUGTRAQx_transferred
- [debian-lts-announce] 20190629 [SECURITY] [DLA 1839-1] expat security update (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- FEDORA-2019-18868e1715 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
- FEDORA-2019-139fcda84d (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
- openSUSE-SU-2019:1777 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
- GLSA-201911-08 (opens in a new tab)vendor-advisoryx_refsource_GENTOOx_transferred
- https://www.oracle.com/security-alerts/cpuapr2020.html (opens in a new tab)x_refsource_MISCx_transferred
- https://www.oracle.com/security-alerts/cpuoct2020.html (opens in a new tab)x_refsource_MISCx_transferred
- https://github.com/libexpat/libexpat/issues/186 (opens in a new tab)x_refsource_MISCx_transferred
- https://github.com/libexpat/libexpat/pull/262 (opens in a new tab)x_refsource_MISCx_transferred
- https://github.com/libexpat/libexpat/pull/262/commits/11f8838bf99ea0a6f0b76f9760c43704d00c4ff6 (opens in a new tab)x_refsource_MISCx_transferred
- https://github.com/libexpat/libexpat/blob/R_2_2_7/expat/Changes (opens in a new tab)x_refsource_MISCx_transferred
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5226 (opens in a new tab)x_refsource_MISCx_transferred
- https://security.netapp.com/advisory/ntap-20190703-0001/ (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://support.f5.com/csp/article/K51011533 (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://www.oracle.com/security-alerts/cpuApr2021.html (opens in a new tab)x_refsource_MISCx_transferred
- https://www.oracle.com/security-alerts/cpuoct2021.html (opens in a new tab)x_refsource_MISCx_transferred
- https://www.tenable.com/security/tns-2021-11 (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://trackcve.app/cve/CVE-2018-20843)Record last updated .