Security readout for executives and security teams
CVE-2021-46143 affects Expat, a common XML parsing library. Versions before 2.4.3 contain an integer overflow in XML prolog parsing. The CVSS score is high because successful exploitation could affect confidentiality, integrity, and availability, but the published vector lists high attack complexity. Exposure is most likely where applications, operating systems, appliances, or embedded products parse XML using libexpat before 2.4.3, including statically bundled copies. The source bundle does not provide a complete affected product list. Treat this as a high-priority dependency remediation item, especially for internet-facing or partner-facing XML processing. It is not presented as actively exploited in the provided sources, so prioritize rapid patching through normal emergency dependency channels. Mitigation focus: Upgrade Expat/libexpat to 2.4.3 or later where directly managed.; Apply fixed OS or vendor packages from affected distributions and product vendors.; Check appliances and embedded software for vendor advisories before assuming coverage..
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
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Open ATT&CK lookupCVE-2021-46143 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 8.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AC:H/AV:N/A:H/C:H/I:H/PR:N/S:U/UI:N
CNA and ADP enrichment extracted from CVE v5
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CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AC:H/AV:N/A:H/C:H/I:H/PR:N/S:U/UI:N2.25.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.1HighVector: CVSS:3.1/AC:H/AV:N/A:H/C:H/I:H/PR:N/S:U/UI:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/libexpat/libexpat/issues/532CVE reference · x_refsource_MISC
- https://github.com/libexpat/libexpat/pull/538CVE reference · x_refsource_MISC
- https://security.netapp.com/advisory/ntap-20220121-0006/CVE reference · x_refsource_CONFIRM
- https://www.tenable.com/security/tns-2022-05CVE reference · x_refsource_CONFIRM
- DSA-5073CVE reference · vendor-advisory, x_refsource_DEBIAN
- https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdfCVE reference · x_refsource_CONFIRM
- GLSA-202209-24CVE reference · vendor-advisory, x_refsource_GENTOO
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Integer Overflow or Wraparound
Integer Overflow or Wraparound represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.