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Vulnerability record · CVE-2019-17007 · published 22 October 2020

CVE-2019-17007: Mozilla network security services improper certificate validation vulnerability

Mozilla · Network Security Services

In Network Security Services before 3.44, a malformed Netscape Certificate Sequence can cause NSS to crash, resulting in a denial of service.

7.5 CVSS 3.1 High EPSS 1.4% · top 28.6% CWE-295 · Improper certificate validation
7.5CVSS 3.1 base score, v2 5.0
1.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
9Affected product versions listed by NVD
8References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

In Network Security Services before 3.44, a malformed Netscape Certificate Sequence can cause NSS to crash, resulting in a denial of service.

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

Affected products

9 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugzilla.mozilla.org/show_bug.cgi?id=1533216 ExploitIssue TrackingPatchVendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-379803.pdf Third Party Advisory
https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.44_release_notes Release NotesVendor Advisory
https://us-cert.cisa.gov/ics/advisories/icsa-21-040-04 Third Party AdvisoryUS Government Resource
https://bugzilla.mozilla.org/show_bug.cgi?id=1533216 ExploitIssue TrackingPatchVendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-379803.pdf Third Party Advisory
https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.44_release_notes Release NotesVendor Advisory
https://us-cert.cisa.gov/ics/advisories/icsa-21-040-04 Third Party AdvisoryUS Government Resource

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2019-17007), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.