CVE-2018-20843 (GCVE-0-2018-20843)

Vulnerability from cvelistv5 – Published: 2019-06-24 16:06 – Updated: 2025-05-30 19:39
VLAI
Summary
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).
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • n/a
  • CWE-611 - Improper Restriction of XML External Entity Reference
Assigner
References
URL Tags
https://usn.ubuntu.com/4040-1/ vendor-advisoryx_refsource_UBUNTU
https://usn.ubuntu.com/4040-2/ vendor-advisoryx_refsource_UBUNTU
https://www.debian.org/security/2019/dsa-4472 vendor-advisoryx_refsource_DEBIAN
https://seclists.org/bugtraq/2019/Jun/39 mailing-listx_refsource_BUGTRAQ
https://lists.debian.org/debian-lts-announce/2019… mailing-listx_refsource_MLIST
https://lists.fedoraproject.org/archives/list/pac… vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac… vendor-advisoryx_refsource_FEDORA
http://lists.opensuse.org/opensuse-security-annou… vendor-advisoryx_refsource_SUSE
https://security.gentoo.org/glsa/201911-08 vendor-advisoryx_refsource_GENTOO
https://www.oracle.com/security-alerts/cpuapr2020.html x_refsource_MISC
https://www.oracle.com/security-alerts/cpuoct2020.html x_refsource_MISC
https://github.com/libexpat/libexpat/issues/186 x_refsource_MISC
https://github.com/libexpat/libexpat/pull/262 x_refsource_MISC
https://github.com/libexpat/libexpat/pull/262/com… x_refsource_MISC
https://github.com/libexpat/libexpat/blob/R_2_2_7… x_refsource_MISC
https://bugs.chromium.org/p/oss-fuzz/issues/detai… x_refsource_MISC
https://security.netapp.com/advisory/ntap-2019070… x_refsource_CONFIRM
https://support.f5.com/csp/article/K51011533 x_refsource_CONFIRM
https://www.oracle.com/security-alerts/cpuApr2021.html x_refsource_MISC
https://www.oracle.com/security-alerts/cpuoct2021.html x_refsource_MISC
https://www.tenable.com/security/tns-2021-11 x_refsource_CONFIRM
Show details on NVD website
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      "id": "CVE-2018-20843",
      "lastModified": "2024-11-21T04:02:17.487",
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      "published": "2019-06-24T17:15:09.980",
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    "microsoft_vex": {
      "current_release_date": "2020-08-18T00:00:00.000Z",
      "cve": "CVE-2018-20843",
      "id": "msrc_CVE-2018-20843",
      "initial_release_date": "2019-06-02T00:00:00.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "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).",
      "url": "https://msrc.microsoft.com/csaf/vex/2019/msrc_cve-2018-20843.json",
      "version": "1"
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    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.