Out-of-bounds write in Mozilla Thunderbird
Priority MEDIUM 44CWE-787Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Partial Red Hat: 28 fixed, 1 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-787 and the CVSS impact.
Summary
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.
Why it matters now
EPSS 0.02994 87th percentileScored 2026-11-07
Fix Partial Thunderbird (Mozilla): 68.3Firefox ESR (Mozilla): 68.3+1 more productRed Hat: 8 advisoriesRed Hat: 28 fixed, 1 without a fix
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Mozilla | Thunderbird | before 68.3 | 68.3 | Patch available | CNA |
| Mozilla | Firefox ESR | before 68.3 | 68.3 | Patch available | CNA |
| Mozilla | Firefox | before 71 | 71 | Patch available | CNA |
- Thunderbird VendorMozilla Affected before 68.3 Fixed in 68.3 Patch available CNA
- Firefox ESR VendorMozilla Affected before 68.3 Fixed in 68.3 Patch available CNA
- Firefox VendorMozilla Affected before 71 Fixed in 71 Patch available CNA
CPE configurations NVD · 25
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* | before 71.0 | Vulnerable | Mozilla |
| cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:* | before 68.3 | Vulnerable | Mozilla |
| cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* | before 68.3.0 | Vulnerable | Mozilla |
| cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:* | 15.1 | Vulnerable | openSUSE |
| cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:* | 16.04 | Vulnerable | Canonical |
| cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* | 18.04 | Vulnerable | Canonical |
| cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:* | 19.10 | Vulnerable | Canonical |
| cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* | 9.0 | Vulnerable | Debian |
| cpe:2.3:o:redhat:enterprise_linux_server_aus:6.6:*:*:*:*:*:*:* | 6.6 | Vulnerable | Red Hat |
| cpe:2.3:o:siemens:ruggedcom_rox_mx5000_firmware:*:*:*:*:*:*:*:* | before 2.14.0 | Vulnerable | Siemens |
- cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* Versions before 71.0 Vulnerable ·Mozilla
- cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:* Versions before 68.3 Vulnerable ·Mozilla
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* Versions before 68.3.0 Vulnerable ·Mozilla
- cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:* Versions 15.1 Vulnerable ·openSUSE
- cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:* Versions 16.04 Vulnerable ·Canonical
- cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* Versions 18.04 Vulnerable ·Canonical
- cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:* Versions 19.10 Vulnerable ·Canonical
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian
- cpe:2.3:o:redhat:enterprise_linux_server_aus:6.6:*:*:*:*:*:*:* Versions 6.6 Vulnerable ·Red Hat
- cpe:2.3:o:siemens:ruggedcom_rox_mx5000_firmware:*:*:*:*:*:*:*:* Versions before 2.14.0 Vulnerable ·Siemens
Show 15 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:h:siemens:ruggedcom_rox_mx5000:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Siemens |
| cpe:2.3:o:siemens:ruggedcom_rox_rx1400_firmware:*:*:*:*:*:*:*:* | before 2.14.0 | Vulnerable | Siemens |
| cpe:2.3:h:siemens:ruggedcom_rox_rx1400:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Siemens |
| cpe:2.3:o:siemens:ruggedcom_rox_rx1500_firmware:*:*:*:*:*:*:*:* | before 2.14.0 | Vulnerable | Siemens |
| cpe:2.3:h:siemens:ruggedcom_rox_rx1500:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Siemens |
| cpe:2.3:o:siemens:ruggedcom_rox_rx1501_firmware:*:*:*:*:*:*:*:* | before 2.14.0 | Vulnerable | Siemens |
| cpe:2.3:h:siemens:ruggedcom_rox_rx1501:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Siemens |
| cpe:2.3:o:siemens:ruggedcom_rox_rx1510_firmware:*:*:*:*:*:*:*:* | before 2.14.0 | Vulnerable | Siemens |
| cpe:2.3:h:siemens:ruggedcom_rox_rx1510:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Siemens |
| cpe:2.3:o:siemens:ruggedcom_rox_rx1511_firmware:*:*:*:*:*:*:*:* | before 2.14.0 | Vulnerable | Siemens |
| cpe:2.3:h:siemens:ruggedcom_rox_rx1511:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Siemens |
| cpe:2.3:o:siemens:ruggedcom_rox_rx1512_firmware:*:*:*:*:*:*:*:* | before 2.14.0 | Vulnerable | Siemens |
| cpe:2.3:h:siemens:ruggedcom_rox_rx1512:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Siemens |
| cpe:2.3:o:siemens:ruggedcom_rox_rx5000_firmware:*:*:*:*:*:*:*:* | before 2.14.0 | Vulnerable | Siemens |
| cpe:2.3:h:siemens:ruggedcom_rox_rx5000:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Siemens |
- cpe:2.3:h:siemens:ruggedcom_rox_mx5000:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
- cpe:2.3:o:siemens:ruggedcom_rox_rx1400_firmware:*:*:*:*:*:*:*:* Versions before 2.14.0 Vulnerable ·Siemens
- cpe:2.3:h:siemens:ruggedcom_rox_rx1400:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
- cpe:2.3:o:siemens:ruggedcom_rox_rx1500_firmware:*:*:*:*:*:*:*:* Versions before 2.14.0 Vulnerable ·Siemens
- cpe:2.3:h:siemens:ruggedcom_rox_rx1500:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
- cpe:2.3:o:siemens:ruggedcom_rox_rx1501_firmware:*:*:*:*:*:*:*:* Versions before 2.14.0 Vulnerable ·Siemens
- cpe:2.3:h:siemens:ruggedcom_rox_rx1501:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
- cpe:2.3:o:siemens:ruggedcom_rox_rx1510_firmware:*:*:*:*:*:*:*:* Versions before 2.14.0 Vulnerable ·Siemens
- cpe:2.3:h:siemens:ruggedcom_rox_rx1510:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
- cpe:2.3:o:siemens:ruggedcom_rox_rx1511_firmware:*:*:*:*:*:*:*:* Versions before 2.14.0 Vulnerable ·Siemens
- cpe:2.3:h:siemens:ruggedcom_rox_rx1511:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
- cpe:2.3:o:siemens:ruggedcom_rox_rx1512_firmware:*:*:*:*:*:*:*:* Versions before 2.14.0 Vulnerable ·Siemens
- cpe:2.3:h:siemens:ruggedcom_rox_rx1512:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
- cpe:2.3:o:siemens:ruggedcom_rox_rx5000_firmware:*:*:*:*:*:*:*:* Versions before 2.14.0 Vulnerable ·Siemens
- cpe:2.3:h:siemens:ruggedcom_rox_rx5000:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
Remediation
- Fix · CNA Thunderbird (Mozilla) Fixed in 68.3
- Fix · CNA Firefox ESR (Mozilla) Fixed in 68.3
- Fix · CNA Firefox (Mozilla) Fixed in 71
Red Hat 8 advisories
- RHSA-2020:1461 Released 2020-04-14 · Red Hat rating Importantnss-softokn security update
- Red Hat Enterprise Linux ComputeNode EUS (v. 7.6) nss-softokn-3.36.0-6.el7_6, nss-softokn-freebl-3.36.0-6.el7_6
- Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.6) nss-softokn-devel-3.36.0-6.el7_6, nss-softokn-freebl-devel-3.36.0-6.el7_6
- Red Hat Enterprise Linux Server EUS (v. 7.6) nss-softokn-3.36.0-6.el7_6, nss-softokn-3.36.0-6.el7_6.ppc, nss-softokn-devel-3.36.0-6.el7_6 +5
- Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) nss-softokn-3.36.0-6.el7_6, nss-softokn-devel-3.36.0-6.el7_6, nss-softokn-freebl-3.36.0-6.el7_6 +1
- RHSA-2020:1345 Released 2020-04-07 · Red Hat rating Importantnss-softokn security update
- Red Hat Enterprise Linux Server AUS (v. 7.4) nss-softokn-3.28.3-9.el7_4, nss-softokn-devel-3.28.3-9.el7_4, nss-softokn-freebl-3.28.3-9.el7_4 +1
- Red Hat Enterprise Linux Server E4S (v. 7.4) nss-softokn-3.28.3-9.el7_4, nss-softokn-devel-3.28.3-9.el7_4, nss-softokn-freebl-3.28.3-9.el7_4 +1
- Red Hat Enterprise Linux Server TUS (v. 7.4) nss-softokn-3.28.3-9.el7_4, nss-softokn-devel-3.28.3-9.el7_4, nss-softokn-freebl-3.28.3-9.el7_4 +1
- RHSA-2020:1267 Released 2020-04-01 · Red Hat rating Importantnss-softokn security update
- Red Hat Enterprise Linux ComputeNode EUS (v. 7.5) nss-softokn-3.36.0-6.el7_5, nss-softokn-freebl-3.36.0-6.el7_5
- Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.5) nss-softokn-devel-3.36.0-6.el7_5, nss-softokn-freebl-devel-3.36.0-6.el7_5
- Red Hat Enterprise Linux Server EUS (v. 7.5) nss-softokn-3.36.0-6.el7_5, nss-softokn-3.36.0-6.el7_5.ppc, nss-softokn-devel-3.36.0-6.el7_5 +5
Show 5 more Red Hat advisories
- RHSA-2020:0466 Released 2020-02-11 · Red Hat rating Importantnss-softokn security update
- Red Hat Enterprise Linux Server AUS (v. 6.6) nss-softokn-3.14.3-23.el6_6, nss-softokn-devel-3.14.3-23.el6_6, nss-softokn-freebl-3.14.3-23.el6_6 +1
- RHSA-2020:0243 Released 2020-01-27 · Red Hat rating Importantnss security update
- Red Hat Enterprise Linux AppStream E4S (v. 8.0) nss-3.44.0-8.el8_0, nss-devel-3.44.0-8.el8_0, nss-softokn-3.44.0-8.el8_0 +7
- RHSA-2019:4190 Released 2019-12-10 · Red Hat rating Importantnss, nss-softokn, nss-util security update
- Red Hat Enterprise Linux Client (v. 7) nss-3.44.0-7.el7_7, nss-softokn-3.44.0-8.el7_7, nss-softokn-freebl-3.44.0-8.el7_7 +3
- Red Hat Enterprise Linux Client Optional (v. 7) nss-devel-3.44.0-7.el7_7, nss-pkcs11-devel-3.44.0-7.el7_7, nss-softokn-devel-3.44.0-8.el7_7 +2
- Red Hat Enterprise Linux ComputeNode (v. 7) nss-3.44.0-7.el7_7, nss-softokn-3.44.0-8.el7_7, nss-softokn-freebl-3.44.0-8.el7_7 +3
- Red Hat Enterprise Linux ComputeNode Optional (v. 7) nss-devel-3.44.0-7.el7_7, nss-pkcs11-devel-3.44.0-7.el7_7, nss-softokn-devel-3.44.0-8.el7_7 +2
- Red Hat Enterprise Linux Server (v. 7) nss-3.44.0-7.el7_7, nss-3.44.0-7.el7_7.ppc, nss-devel-3.44.0-7.el7_7 +15
- Red Hat Enterprise Linux Server Optional (v. 7) nss-pkcs11-devel-3.44.0-7.el7_7, nss-pkcs11-devel-3.44.0-7.el7_7.ppc
- Red Hat Enterprise Linux Workstation (v. 7) nss-3.44.0-7.el7_7, nss-devel-3.44.0-7.el7_7, nss-softokn-3.44.0-8.el7_7 +7
- Red Hat Enterprise Linux Workstation Optional (v. 7) nss-pkcs11-devel-3.44.0-7.el7_7
- RHSA-2019:4152 Released 2019-12-10 · Red Hat rating Importantnss-softokn security update
- Red Hat Enterprise Linux Desktop (v. 6) nss-softokn-3.44.0-6.el6_10, nss-softokn-freebl-3.44.0-6.el6_10
- Red Hat Enterprise Linux Desktop Optional (v. 6) nss-softokn-devel-3.44.0-6.el6_10, nss-softokn-freebl-devel-3.44.0-6.el6_10
- Red Hat Enterprise Linux HPC Node (v. 6) nss-softokn-3.44.0-6.el6_10, nss-softokn-freebl-3.44.0-6.el6_10
- Red Hat Enterprise Linux HPC Node Optional (v. 6) nss-softokn-devel-3.44.0-6.el6_10, nss-softokn-freebl-devel-3.44.0-6.el6_10
- Red Hat Enterprise Linux Server (v. 6) nss-softokn-3.44.0-6.el6_10, nss-softokn-3.44.0-6.el6_10.ppc, nss-softokn-devel-3.44.0-6.el6_10 +5
- Red Hat Enterprise Linux Workstation (v. 6) nss-softokn-3.44.0-6.el6_10, nss-softokn-devel-3.44.0-6.el6_10, nss-softokn-freebl-3.44.0-6.el6_10 +1
- RHSA-2019:4114 Released 2019-12-09 · Red Hat rating Importantnss security update
- Red Hat Enterprise Linux AppStream (v. 8) nss-3.44.0-9.el8_1, nss-devel-3.44.0-9.el8_1, nss-softokn-3.44.0-9.el8_1 +7
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Advisory ·
Mozilla Firefox, Firefox ESR, Thunderbird — USN-4241-1
10 records Highest priority Priority MEDIUM 6 MEDIUM, 4 LOW
Other records, highest priority first
- TI-2019-12707 Out-of-bounds write in Mozilla Firefox ESRPriority MEDIUM 43
- TI-2019-12700 Type confusion in Mozilla Firefox ESRPriority MEDIUM 43
- TI-2019-12695 Out-of-bounds write in Mozilla ThunderbirdPriority MEDIUM 42
- Advisory ·
Mozilla Firefox, Firefox ESR, Thunderbird — openSUSE-SU-2020:0003
7 records Highest priority Priority MEDIUM 4 MEDIUM, 3 LOW
Other records, highest priority first
- TI-2019-12695 Out-of-bounds write in Mozilla ThunderbirdPriority MEDIUM 42
- TI-2019-12691 Use after free in Mozilla ThunderbirdPriority MEDIUM 42
- TI-2019-12688 Out-of-bounds write in Mozilla ThunderbirdPriority MEDIUM 42
Show 1 more group
- Advisory ·
Mozilla Firefox, Firefox ESR, Thunderbird — openSUSE-SU-2020:0002
7 records Highest priority Priority MEDIUM 4 MEDIUM, 3 LOW
Other records, highest priority first
- TI-2019-12695 Out-of-bounds write in Mozilla ThunderbirdPriority MEDIUM 42
- TI-2019-12691 Use after free in Mozilla ThunderbirdPriority MEDIUM 42
- TI-2019-12688 Out-of-bounds write in Mozilla ThunderbirdPriority MEDIUM 42
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 5 | Affected | No fix planned: Out of support scope |
| Red Hat Ansible Tower 3.4 for RHEL 7 Server | Fixed | — |
| Red Hat Enterprise Linux AppStream (v. 8) | Fixed | RHSA-2019:4114 |
| Red Hat Enterprise Linux AppStream E4S (v. 8.0) | Fixed | RHSA-2020:0243 |
| Red Hat Enterprise Linux Client (v. 7) | Fixed | RHSA-2019:4190 |
| Red Hat Enterprise Linux Client Optional (v. 7) | Fixed | RHSA-2019:4190 |
| Red Hat Enterprise Linux ComputeNode (v. 7) | Fixed | RHSA-2019:4190 |
| Red Hat Enterprise Linux ComputeNode EUS (v. 7.5) | Fixed | RHSA-2020:1267 |
| Red Hat Enterprise Linux ComputeNode EUS (v. 7.6) | Fixed | RHSA-2020:1461 |
| Red Hat Enterprise Linux ComputeNode Optional (v. 7) | Fixed | RHSA-2019:4190 |
| Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.5) | Fixed | RHSA-2020:1267 |
| Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.6) | Fixed | RHSA-2020:1461 |
| Red Hat Enterprise Linux Desktop (v. 6) | Fixed | RHSA-2019:4152 |
| Red Hat Enterprise Linux Desktop Optional (v. 6) | Fixed | RHSA-2019:4152 |
| Red Hat Enterprise Linux HPC Node (v. 6) | Fixed | RHSA-2019:4152 |
| Red Hat Enterprise Linux HPC Node Optional (v. 6) | Fixed | RHSA-2019:4152 |
| Red Hat Enterprise Linux Server (v. 6) | Fixed | RHSA-2019:4152 |
| Red Hat Enterprise Linux Server (v. 7) | Fixed | RHSA-2019:4190 |
| Red Hat Enterprise Linux Server AUS (v. 6.6) | Fixed | RHSA-2020:0466 |
| Red Hat Enterprise Linux Server AUS (v. 7.4) | Fixed | RHSA-2020:1345 |
| Red Hat Enterprise Linux Server E4S (v. 7.4) | Fixed | RHSA-2020:1345 |
| Red Hat Enterprise Linux Server EUS (v. 7.5) | Fixed | RHSA-2020:1267 |
| Red Hat Enterprise Linux Server EUS (v. 7.6) | Fixed | RHSA-2020:1461 |
| Red Hat Enterprise Linux Server Optional (v. 7) | Fixed | RHSA-2019:4190 |
| Red Hat Enterprise Linux Server TUS (v. 7.4) | Fixed | RHSA-2020:1345 |
| Red Hat Enterprise Linux Workstation (v. 6) | Fixed | RHSA-2019:4152 |
| Red Hat Enterprise Linux Workstation (v. 7) | Fixed | RHSA-2019:4190 |
| Red Hat Enterprise Linux Workstation Optional (v. 7) | Fixed | RHSA-2019:4190 |
| Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) | Fixed | RHSA-2020:1461 |
Not affected: 4 products
- Red Hat Enterprise Linux 5
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
Timeline
- 2026-10-02 Threatist record created from CVE-2019-11745
- 2026-10-03 Alias added: GHSA-gmvm-jpfj-v3f5
References
Advisory 16
- https://www.mozilla.org/security/advisories/mfsa2019-36/
- https://www.mozilla.org/security/advisories/mfsa2019-38/
- https://www.mozilla.org/security/advisories/mfsa2019-37/
- openSUSE-SU-2020:0003
- openSUSE-SU-2020:0002
- openSUSE-SU-2020:0008
- USN-4241-1
- RHSA-2020:0243
- RHSA-2020:0466
- GLSA-202003-02
- GLSA-202003-10
- GLSA-202003-37
- USN-4335-1
- [debian-lts-announce] 20200929 [SECURITY] [DLA 2388-1] nss security update
- https://cert-portal.siemens.com/productcert/pdf/ssa-379803.pdf
- https://us-cert.cisa.gov/ics/advisories/icsa-21-040-04
More Mozilla Firefox vulnerabilities
- TI-2024-08981 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.8
- TI-2022-09832 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.6
- TI-2019-08769 Improper input validation in Mozilla Firefox ESR KEVCVSS 3.1CRITICAL 10.0
- TI-2010-03577 Mozilla Firefox 3.5.x through 3.5.14 and 3.6.x through 3.6.11, Thunderbird 3.1.6 before… KEVCVSS 3.1CRITICAL 9.8
- TI-2023-04799 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
- TI-2023-04477 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
Sources
- CVE-2019-11745 · CVE Program
- CVE-2019-11745 · NVD
- FIRST EPSS
- GHSA-gmvm-jpfj-v3f5 · GitHub Advisory Database · CC BY 4.0
- CVE-2019-11745 · Red Hat security data · CC BY 4.0
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