CVE-2019-16263

Name: CVE-2019-16263
Creator: NVD / NIST
Published: 2019-10-07T12:15:11.68+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.4/10EPSS 1.03%

Last modified Jun 17, 2026

CVE-2019-16263 is a high-severity vulnerability rated 7.4/10 on the CVSS scale. The Twitter Kit framework through 3.4.2 for iOS does not properly validate the api.twitter.com SSL certificate. Although the certificate chain must contain one of a set of pinned certificates, there are certain implementation errors such as a lack of hostname verification. EPSS estimates a 1.03% chance of exploitation in the next 30 days.

Description

The Twitter Kit framework through 3.4.2 for iOS does not properly validate the api.twitter.com SSL certificate. Although the certificate chain must contain one of a set of pinned certificates, there are certain implementation errors such as a lack of hostname verification. NOTE: this is an end-of-life product.

Metrics

CVSS 3.1

7.4/10

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

EPSS Probability

1.03%

59.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-295

Affected Software

Vendor	Product	Versions
Twitter	Twitter Kit	<= 3.4.2

References

https://blog.appicaptor.com/2019/10/04/vulnerable-library-warning-twitterkit-for-ios/Third Party Advisory
https://github.com/twitter-archive/twitter-kit-ios/blob/ac42e1351a66afa5ff7718d04d64a905dafe1f41/TwitterCore/TwitterCore/Networking/Security/TWTRServerTrustEvaluator.m#L75-L81Third Party Advisory
https://www.sit.fraunhofer.de/fileadmin/dokumente/CVE/Advisory_TwitterKit_for_iOS_CVE-2019-16263.pdfExploit, Third Party Advisory
https://blog.appicaptor.com/2019/10/04/vulnerable-library-warning-twitterkit-for-ios/Third Party Advisory
https://github.com/twitter-archive/twitter-kit-ios/blob/ac42e1351a66afa5ff7718d04d64a905dafe1f41/TwitterCore/TwitterCore/Networking/Security/TWTRServerTrustEvaluator.m#L75-L81Third Party Advisory
https://www.sit.fraunhofer.de/fileadmin/dokumente/CVE/Advisory_TwitterKit_for_iOS_CVE-2019-16263.pdfExploit, Third Party Advisory

Timeline

Published: Oct 7, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-16263?

How severe is CVE-2019-16263?

CVE-2019-16263 has a CVSS score of 7.4/10 (HIGH severity). The EPSS model estimates a 1.03% probability of exploitation in the next 30 days.

How do I fix CVE-2019-16263?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-16263?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST