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CVE-2020-10531: An issue was discovered in International Components for Unicode (ICU) for C/C++ through 66.1

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HIGH 8.8WATCHLISTUPGRADEMITIGATEMITIGATE

CVE-2020-10531 is a high-severity flaw (CVSS 8.8) affecting international components for unicode, enterprise linux desktop, enterprise linux server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

  • High severity
  • On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score8.8 (High)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionRequired
EPSS exploit chance2.7% (top 14%)
CISA exploited listNo
WeaknessCWE-190, CWE-787
Published2020-03-12
Last modified2026-10-14
Publisher (CNA): MITRE · Vendor: fedoraproject · google · icu-project · redhat

Share: LinkedIn · X · Reddit

Last updated 2026-10-14 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

icu-project international components for unicode UPGRADE
Affected: <= 66.1
Fixed in: newer than 66.1
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy international-components-for-unicode || rpm -q international-components-for-unicode || international-components-for-unicode --version
2. UPGRADE to newer than 66.1 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade international-components-for-unicode
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade international-components-for-unicode
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
redhat enterprise linux desktop MITIGATE
Affected: 6.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 6.0
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
redhat enterprise linux server MITIGATE
Affected: 6.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 6.0
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
redhat enterprise linux workstation MITIGATE
Affected: 6.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 6.0
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
google chrome UPGRADE
Affected: < 80.0.3987.122
Fixed in: 80.0.3987.122
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy chrome || rpm -q chrome || chrome --version
2. UPGRADE to 80.0.3987.122 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade chrome
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade chrome
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
fedoraproject fedora MITIGATE
Affected: 30 · 31 · 33
Fixed in: no fixed release known
Safe to downgrade to: a release before 30
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-10531?

international components for unicode: upgrade to newer than 66.1; enterprise linux desktop: mitigate or apply the listed mitigation; enterprise linux server: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-10531 being exploited?

CVE-2020-10531 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-10531 affect?

CVE-2020-10531 affects international components for unicode, enterprise linux desktop, enterprise linux server. Severity is high (CVSS 8.8). 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.

How urgent is CVE-2020-10531?

Priority 57/100. High severity; On your watchlist

Software pages

Google Chrome vulnerabilities

Related CVEs

References

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