How severe is CVE-2021-4438?

CVE-2021-4438 has a CVSS score of 5.3/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2021-4438?

CVE-2021-4438 affects the following packages: @kyivstarteam/react-native-sms-user-consent (npm). Ecosystems affected: npm.

How do I fix CVE-2021-4438?

Update @kyivstarteam/react-native-sms-user-consent to 1.1.5 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-4438 is resolved across your whole dependency graph.

How do I detect CVE-2021-4438 in my npm dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for @kyivstarteam/react-native-sms-user-consent, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2021-4438 if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Is CVE-2021-4438 actively exploited in the wild?

No public exploit code has been indexed for CVE-2021-4438 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2021-4438?

CVE-2021-4438 has an EPSS (Exploit Prediction Scoring System) score of 0.3%, placing it in the 18th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2021-4438?

CVE-2021-4438 is classified as CWE-926 (CWE-926). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2021-4438 published, and has it been updated?

CVE-2021-4438 was published on April 7, 2024 and was last updated on October 20, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

📦

📦 npm

Not in CISA KEV

MEDIUM severity

CVE-2021-4438 — @kyivstarteam/react-nativ…

MEDIUMFix: kyivstarteam/react-native-sms-user-consent@5423dcb

CVE-2021-4438 is a medium-severity (CVSS 5.3) CWE-926 vulnerability in @kyivstarteam/react-native-sms-user-consent. A fix is available for @kyivstarteam/react-native-sms-user-consent — see the affected versions and patch details below.

React Native Sms User Consent Intent Redirection Vulnerability

Also known asGHSA-r956-2553-vvhr

Published

Apr 7, 2024

Updated

Oct 20, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Nov 6, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2021-4438.

EPSS Exploitation Probability

via FIRST.org ↗

0.3%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs18th percentile — riskier than 18% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

0other npm packages depend on this — each one inherits the vulnerability until it's patched upstream

@kyivstarteam/react-native-sms-user-consentnpm

44downloads / week

Description

A vulnerability, which was classified as critical, has been found in kyivstarteam react-native-sms-user-consent up to 1.1.4 on Android. Affected by this issue is the function registerReceiver of the file android/src/main/java/ua/kyivstar/reactnativesmsuserconsent/SmsUserConsentModule.kt. The manipulation leads to improper export of android application components. Attacking locally is a requirement. Upgrading to version 1.1.5 is able to address this issue. The name of the patch is 5423dcb0cd3e4d573b5520a71fa08aa279e4c3c7. It is recommended to upgrade the affected component. The identifier of this vulnerability is VDB-259508.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
📦npm	`@kyivstarteam/react-native-sms-user-consent`	all versions	1.1.5`npm install @kyivstarteam/react-native-sms-user-consent@1.1.5`

Affected Products

1 product · 1 configurations

Application

react native sms user consentkyivstar

≤ 1.1.4

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for @kyivstarteam/react-native-sms-user-consent, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update @kyivstarteam/react-native-sms-user-consent to 1.1.5 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-4438 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2021-4438 in your dependencies?

Find it across npm, including transitive dependencies.

Scan my dependencies How O3 SCA works

CVSS Score

5.3/10CVSS v3 base

Vector breakdown

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

Low

Raw vector

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

CWE Classification

CWE-926CWE-926

Weaponization

No Nuclei template, Metasploit module or public proof-of-concept found.

OpenSSF Scorecard

Package health score

react-native-sms-user-consent

1.7/10

Code-Review0/10

Maintained0/10

Branch-Protection0/10

Assessed Oct 19, 2026

Timeline

Disclosed

Apr 7, 2024

Last updated

Oct 20, 2026

Identifiers

CVE-2021-4438

GHSA-r956-2553-vvhr

References

Advisorygithub.com · 1.1.5 Advisoryvuldb.com Advisoryvuldb.com Advisorynvd.nist.gov · CVE 2021 4438 Fixgithub.com · 5423dcb0cd3e4d573b5520a71fa08aa279e4c3c7 Fixgithub.com Packagegithub.com · react native sms user consent

Related vulnerabilities

This CVE is medium severity — higher than any of the other 1 CVE with CWE-926 (highest there: low).

CVE-2024-27086Browse all CWE-926

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedOct 20, 2026