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Vulnerability record · CVE-2019-11745 · published 8 January 2020

CVE-2019-11745: Mozilla firefox out-of-bounds write vulnerability

Mozilla · Firefox

When encrypting with a block cipher, if a call to NSC_EncryptUpdate was made with data smaller than the block size, a small out of bounds write could occur. This could have caused heap corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 68.3, Firefox ESR < 68.3, and Firefox < 71.

8.8 CVSS 3.1 High EPSS 3.0% · top 13.2% CWE-787 · Out-of-bounds write
8.8CVSS 3.1 base score, v2 6.8
3.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
15Affected product versions listed by NVD
34References
17 Jun 2026Last modified by NVD

Description

When encrypting with a block cipher, if a call to NSC_EncryptUpdate was made with data smaller than the block size, a small out of bounds write could occur. This could have caused heap corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 68.3, Firefox ESR < 68.3, and Firefox < 71.

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

Affected products

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

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00000.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00001.html Issue TrackingMailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00006.html Mailing ListThird Party Advisory
https://access.redhat.com/errata/RHSA-2020:0243 Third Party Advisory
https://access.redhat.com/errata/RHSA-2020:0466 Third Party Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1586176 Issue TrackingPatchVendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-379803.pdf Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/09/msg00029.html Mailing ListThird Party Advisory
https://security.gentoo.org/glsa/202003-02 Third Party Advisory
https://security.gentoo.org/glsa/202003-10 Third Party Advisory
https://security.gentoo.org/glsa/202003-37 Third Party Advisory
https://us-cert.cisa.gov/ics/advisories/icsa-21-040-04 Third Party AdvisoryUS Government Resource
https://usn.ubuntu.com/4241-1/ Third Party Advisory
https://usn.ubuntu.com/4335-1/ Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2019-36/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-37/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-38/ Vendor Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00000.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00001.html Issue TrackingMailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00006.html Mailing ListThird Party Advisory
https://access.redhat.com/errata/RHSA-2020:0243 Third Party Advisory
https://access.redhat.com/errata/RHSA-2020:0466 Third Party Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1586176 Issue TrackingPatchVendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-379803.pdf Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/09/msg00029.html Mailing ListThird Party Advisory
https://security.gentoo.org/glsa/202003-02 Third Party Advisory
https://security.gentoo.org/glsa/202003-10 Third Party Advisory
https://security.gentoo.org/glsa/202003-37 Third Party Advisory
https://us-cert.cisa.gov/ics/advisories/icsa-21-040-04 Third Party AdvisoryUS Government Resource
https://usn.ubuntu.com/4241-1/ Third Party Advisory
https://usn.ubuntu.com/4335-1/ Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2019-36/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-37/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-38/ Vendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2019-11745), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.