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Vulnerabilities

Vulnerability · CVE-2020-10531

An issue was discovered in International Components for Unicode (ICU) for C/C++ through 66.1.

Published Mar 12, 2020 · catalog updated Oct 14, 2026 · international components for unicode

Check if you run it

No confirmed exploitation is on record for CVE-2020-10531. EPSS is 2.67%. Act only if a listed version of international components for unicode is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
2.67%
Remediation
Advisory link
Affected products
cpe canonical/ubuntu linux · cpe debian/debian linux · cpe fedoraproject/fedora · cpe google/chrome · cpe icu-project/international components for unicode · cpe opensuse/leap

An issue was discovered in International Components for Unicode (ICU) for C/C++ through 66.1. An integer overflow, leading to a heap-based buffer overflow, exists in the UnicodeString::doAppend() function in common/unistr.cpp.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe canonical/ubuntu linux12.04
  • cpe debian/debian linux8.0
  • cpe fedoraproject/fedora30
  • cpe fedoraproject/fedora31
  • cpe fedoraproject/fedora33
  • cpe google/chromeversion unspecified
  • cpe icu-project/international components for unicodeversion unspecified
  • cpe opensuse/leap15.1
  • cpe oracle/banking extensibility workbench14.3.0
  • cpe redhat/enterprise linux desktop6.0
  • cpe redhat/enterprise linux server6.0
  • cpe redhat/enterprise linux workstation6.0

How to fix CVE-2020-10531

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2020-10531. EPSS is 2.67%. Act only if a listed version of international components for unicode is installed.

Which versions are affected?

Compare what you have installed with canonical/ubuntu linux 12.04; debian/debian linux 8.0; oracle/banking extensibility workbench 14.3.0; redhat/enterprise linux desktop 6.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-190: Integer Overflow; CWE-787: Out-of-bounds Write. EPSS 2.67%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 12, 2020 · NIST NVD

    Detected

    An issue was discovered in International Components for Unicode (ICU) for C/C++ through 66.1. An integer overflow, leading to a heap-based buffer overflow, exists in the UnicodeString::doAppend() function in common/unistr.cpp.

  2. Oct 14, 2026 · NIST NVD

    Updated

    An issue was discovered in International Components for Unicode (ICU) for C/C++ through 66.1. An integer overflow, leading to a heap-based buffer overflow, exists in the UnicodeString::doAppend() function in common/unistr.cpp.

Sources

  • CVE.orgVulnerability recordCVE-2020-10531

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2020-10531

    30-day exploitation probability 2.7%

    first.org
  • NIST NVDVulnerability recordCVE-2020-10531

    An issue was discovered in International Components for Unicode (ICU) for C/C++ through 66.1. An integer overflow, leading to a heap-based buffer overflow, exists in the UnicodeString::doAppend() function in common/unistr.cpp.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 16, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.