Mozilla Firefox up to 67.x Network Security Services certificate validation

CVSS Meta Temp Score
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CTI Interest Score
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5.0$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, was found in Mozilla Firefox up to 67.x. This vulnerability affects unknown code of the component Network Security Services. The manipulation results in certificate validation. This vulnerability is cataloged as CVE-2019-11727. The attack may be launched remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in Mozilla Firefox up to 67.x (Web Browser). Affected is some unknown functionality of the component Network Security Services. The manipulation with an unknown input leads to a certificate validation vulnerability. CWE is classifying the issue as CWE-295. The product does not validate, or incorrectly validates, a certificate. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

A vulnerability exists where it possible to force Network Security Services (NSS) to sign CertificateVerify with PKCS#1 v1.5 signatures when those are the only ones advertised by server in CertificateRequest in TLS 1.3. PKCS#1 v1.5 signatures should not be used for TLS 1.3 messages. This vulnerability affects Firefox < 68.

The weakness was shared 07/23/2019 (Website). The advisory is shared for download at security.gentoo.org. This vulnerability is traded as CVE-2019-11727 since 05/03/2019. The exploitability is told to be difficult. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1587.003.

The vulnerability scanner Nessus provides a plugin with the ID 247767 (Linux Distros Unpatched Vulnerability : CVE-2019-11727), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 68.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (247767). The entries VDB-138488, VDB-138489, VDB-138490 and VDB-138491 are related to this item. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.1
VulDB Meta Temp Score: 5.0

VulDB Base Score: 5.0
VulDB Temp Score: 4.8
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.3
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Certificate validation
CWE: CWE-295 / CWE-287
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 247767
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2019-11727

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Firefox 68.0

Timelineinfo

05/03/2019 🔍
07/23/2019 +81 days 🔍
07/23/2019 +0 days 🔍
08/12/2025 +2212 days 🔍

Sourcesinfo

Vendor: mozilla.org
Product: mozilla.org

Advisory: RHSA-2019:1951
Status: Confirmed

CVE: CVE-2019-11727 (🔍)
GCVE (CVE): GCVE-0-2019-11727
GCVE (VulDB): GCVE-100-138504
See also: 🔍

Entryinfo

Created: 07/23/2019 21:56
Updated: 08/12/2025 02:06
Changes: 07/23/2019 21:56 (59), 07/10/2020 09:22 (1), 11/06/2023 09:22 (4), 08/12/2025 02:06 (18)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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