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CVE-2020-21913

16
FAUCET Score

CVE-2020-21913 describes a use-after-free vulnerability in International Components for Unicode (ICU) v66.1, specifically within the pkg_createWithAssemblyCode function, affecting Debian Linux distributions utilizing ICU. With a CVSS score of 5.5 (Medium), this vulnerability requires local access and user interaction (e.g., social engineering) to trigger, leading to a potential denial of service. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 66.1CPE matchmatch criteria
cpe:2.3:a:unicode:international_components_for_unicode:*:*:*:*:*:*:*:*
9.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
10.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.5MEDIUM

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
1.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.22%
Probability of exploitation in next 30 days
EPSS Percentile
65.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0122 is in the 76th percentile among its peer group of 5,760 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2020-21913Moderate

icu: Use after free in pkg_createWithAssemblyCode function in tools/pkgdata/pkgdata.cpp

Sep 20, 2021

References

github.com / unicode-org/icu/pull/886
PatchThird Party Advisory
lists.debian.org / debian-lts-announce/2021/10/msg00008.html
Mailing ListThird Party Advisory
unicode-org.atlassian.net / browse/ICU-20850
ExploitVendor Advisory
debian.org / security/2021/dsa-5014
Third Party Advisory