CVE-2020-21913

Exp

International Components for Unicode (ICU-20850) v66.1 was discovered to contain a use after free bug in the pkg_createWithAssemblyCode function in the file tools/pkgdata/pkgdata.cpp.

Published: 2021-09-20 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-21913 is rated Exploit Available (59.8/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.13%). 1 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +1.03% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2020-21913

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2020-21913

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.10% 1.13% +1.03%
2 2025-11-21 0.32% 0.10% -0.22%
3 2025-11-18 — 0.32% —

Full EPSS history (14 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-21913

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.5 3.1 MEDIUM
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 3.6 [email protected]
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2020-21913

OS Trackers for CVE-2020-21913

vendor priority summary link
alpine medium CVE-2020-21913: 1 source package rows (icu); 7 state rows across 7 repos (3.17-main, 3.18-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 7, open 0. https://security.alpinelinux.org/vuln/CVE-2020-21913
debian not yet assigned CVE-2020-21913 not yet assigned priority: Debian including 1 source packages (icu), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2020-21913
redhat medium — https://access.redhat.com/security/cve/CVE-2020-21913
suse medium CVE-2020-21913 severity moderate: SUSE including 372 source package names (0.0.17-1.1:libicu73_2-73.2-150000.1.3.1, 0.0.17-1.1:libicu73_2-ledata-73.2-150000.1.3.1, …), 1449 product×package rows across 344 product lines (Container bci/dotnet-aspnet, Container bci/dotnet-runtime, … (344 product lines)): Fixed 1210, Known Affected 231, Known Not Affected 8. https://www.suse.com/security/cve/CVE-2020-21913/
ubuntu low CVE-2020-21913 low priority: Ubuntu including 7 source packages (firefox, icu, …), 56 status rows across 8 suites (bionic, focal, hirsute, impish, jammy, trusty, upstream, xenial): DNE 25, not-affected 21, needs-triage 6, released 4. https://ubuntu.com/security/CVE-2020-21913

Affected software / configurations for CVE-2020-21913

Vendor Product Version Raw CPE
unicode international_components_for_unicode < 66.1 cpe:2.3:a:unicode:international_components_for_unicode:*:*:*:*:*:*:*:*
debian debian_linux 9.0 cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
debian debian_linux 10.0 cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*

References for CVE-2020-21913

cvelogic Threat Intelligence