nss: Out-of-bounds write when passing an output buffer smaller than the block size to NSC_EncryptUpdate
Published Jan 8, 2020
8.8
HIGHCVSS 3.1
EPSS 2.99%
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.
Affected products
-
- Version before 71StatusaffectedConstraints-
- Version
-
- Version before 68.3StatusaffectedConstraints-
- Version
-
- Version before 68.3StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Mozilla | Firefox | n/a |
| ||||||
| Mozilla | Firefox ESR | n/a |
| ||||||
| Mozilla | Thunderbird | n/a |
|
Configuration 1
- < 71.0
- < 68.3
- < 68.3.0
Configuration 3
- 16.04
- 18.04
- 19.10
Configuration 4
- 9.0
Configuration 5
- 6.6
Configuration 6
- < 2.14.0
Running on/with
- n/a
Configuration 7
- < 2.14.0
Running on/with
- n/a
Configuration 8
- < 2.14.0
Running on/with
- n/a
Configuration 9
- < 2.14.0
Running on/with
- n/a
Configuration 10
- < 2.14.0
Running on/with
- n/a
Configuration 11
- < 2.14.0
Running on/with
- n/a
Configuration 12
- < 2.14.0
Running on/with
- n/a
Configuration 13
- < 2.14.0
Running on/with
- n/a
No data.
Red Hat Ansible Tower 3.4 for RHEL 7
ansible-tower-34/ansible-tower-memcached:1.4.15-28
Fixed · RHBA-2020:0547
Red Hat Ansible Tower 3.4 for RHEL 7
ansible-tower-35/ansible-tower-memcached:1.4.15-28
Fixed · RHBA-2020:0547
Red Hat Ansible Tower 3.4 for RHEL 7
ansible-tower-37/ansible-tower-memcached-rhel7:1.4.15-28
Fixed · RHBA-2020:0547
Red Hat Enterprise Linux 6
nss-softokn-0:3.44.0-6.el6_10
Fixed · RHSA-2019:4152
Red Hat Enterprise Linux 6.6 Advanced Update Support
nss-softokn-0:3.14.3-23.el6_6
Fixed · RHSA-2020:0466
Red Hat Enterprise Linux 7
nss-0:3.44.0-7.el7_7
Fixed · RHSA-2019:4190
Red Hat Enterprise Linux 7
nss-softokn-0:3.44.0-8.el7_7
Fixed · RHSA-2019:4190
Red Hat Enterprise Linux 7
nss-util-0:3.44.0-4.el7_7
Fixed · RHSA-2019:4190
Red Hat Enterprise Linux 7.4 Advanced Update Support
nss-softokn-0:3.28.3-9.el7_4
Fixed · RHSA-2020:1345
Red Hat Enterprise Linux 7.4 Telco Extended Update Support
nss-softokn-0:3.28.3-9.el7_4
Fixed · RHSA-2020:1345
Red Hat Enterprise Linux 7.4 Update Services for SAP Solutions
nss-softokn-0:3.28.3-9.el7_4
Fixed · RHSA-2020:1345
Red Hat Enterprise Linux 7.5 Extended Update Support
nss-softokn-0:3.36.0-6.el7_5
Fixed · RHSA-2020:1267
Red Hat Enterprise Linux 7.6 Extended Update Support
nss-softokn-0:3.36.0-6.el7_6
Fixed · RHSA-2020:1461
Red Hat Enterprise Linux 8
nss-0:3.44.0-9.el8_1
Fixed · RHSA-2019:4114
Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions
nss-0:3.44.0-8.el8_0
Fixed · RHSA-2020:0243
Red Hat Enterprise Linux 5
firefox
Not affected
Red Hat Enterprise Linux 5
nss
Out of support scope
Red Hat Enterprise Linux 5
thunderbird
Not affected
Red Hat Enterprise Linux 6
firefox
Not affected
Red Hat Enterprise Linux 6
thunderbird
Not affected
Red Hat Enterprise Linux 7
firefox
Not affected
Red Hat Enterprise Linux 7
thunderbird
Not affected
Red Hat Enterprise Linux 8
firefox
Not affected
Red Hat Enterprise Linux 8
thunderbird
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Ansible Tower 3.4 for RHEL 7 | ansible-tower-34/ansible-tower-memcached:1.4.15-28 | Fixed | RHBA-2020:0547 |
| Red Hat Ansible Tower 3.4 for RHEL 7 | ansible-tower-35/ansible-tower-memcached:1.4.15-28 | Fixed | RHBA-2020:0547 |
| Red Hat Ansible Tower 3.4 for RHEL 7 | ansible-tower-37/ansible-tower-memcached-rhel7:1.4.15-28 | Fixed | RHBA-2020:0547 |
| Red Hat Enterprise Linux 6 | nss-softokn-0:3.44.0-6.el6_10 | Fixed | RHSA-2019:4152 |
| Red Hat Enterprise Linux 6.6 Advanced Update Support | nss-softokn-0:3.14.3-23.el6_6 | Fixed | RHSA-2020:0466 |
| Red Hat Enterprise Linux 7 | nss-0:3.44.0-7.el7_7 | Fixed | RHSA-2019:4190 |
| Red Hat Enterprise Linux 7 | nss-softokn-0:3.44.0-8.el7_7 | Fixed | RHSA-2019:4190 |
| Red Hat Enterprise Linux 7 | nss-util-0:3.44.0-4.el7_7 | Fixed | RHSA-2019:4190 |
| Red Hat Enterprise Linux 7.4 Advanced Update Support | nss-softokn-0:3.28.3-9.el7_4 | Fixed | RHSA-2020:1345 |
| Red Hat Enterprise Linux 7.4 Telco Extended Update Support | nss-softokn-0:3.28.3-9.el7_4 | Fixed | RHSA-2020:1345 |
| Red Hat Enterprise Linux 7.4 Update Services for SAP Solutions | nss-softokn-0:3.28.3-9.el7_4 | Fixed | RHSA-2020:1345 |
| Red Hat Enterprise Linux 7.5 Extended Update Support | nss-softokn-0:3.36.0-6.el7_5 | Fixed | RHSA-2020:1267 |
| Red Hat Enterprise Linux 7.6 Extended Update Support | nss-softokn-0:3.36.0-6.el7_6 | Fixed | RHSA-2020:1461 |
| Red Hat Enterprise Linux 8 | nss-0:3.44.0-9.el8_1 | Fixed | RHSA-2019:4114 |
| Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions | nss-0:3.44.0-8.el8_0 | Fixed | RHSA-2020:0243 |
| Red Hat Enterprise Linux 5 | firefox | Not affected | n/a |
| Red Hat Enterprise Linux 5 | nss | Out of support scope | n/a |
| Red Hat Enterprise Linux 5 | thunderbird | Not affected | n/a |
| Red Hat Enterprise Linux 6 | firefox | Not affected | n/a |
| Red Hat Enterprise Linux 6 | thunderbird | Not affected | n/a |
| Red Hat Enterprise Linux 7 | firefox | Not affected | n/a |
| Red Hat Enterprise Linux 7 | thunderbird | Not affected | n/a |
| Red Hat Enterprise Linux 8 | firefox | Not affected | n/a |
| Red Hat Enterprise Linux 8 | thunderbird | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
Firefox and Thunderbird on Red Hat Enterprise Linux are built against the system nss library.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
AV:N/AC:M/Au:N/C:P/I:P/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 4, 2026.
Score over time
2021-2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Table of values (19 key points)
Flat stretches are collapsed. Showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 4, 2026 | 2.99% (0.02994) | 86.89th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.99% (0.02994) | 85.55th | v5 (v2026.06.15) |
| Nov 21, 2025 | 0.81% (0.00806) | 73.42th | v4 (v2025.03.14) |
| Nov 18, 2025 | 3.05% (0.03054) | 85.45th | v4 (v2025.03.14) |
| Mar 17, 2025 | 0.38% (0.00382) | 57.45th | v4 (v2025.03.14) |
| Dec 17, 2024 | 1.94% (0.01943) | 88.36th | v3 (v2023.03.01) |
| Jul 6, 2024 | 0.29% (0.00289) | 69.13th | v3 (v2023.03.01) |
| Apr 18, 2024 | 0.33% (0.00333) | 70.90th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.37% (0.00370) | 71.83th | v3 (v2023.03.01) |
| Nov 29, 2023 | 0.37% (0.00370) | 69.58th | v3 (v2023.03.01) |
| Nov 12, 2023 | 0.29% (0.00288) | 65.41th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.27% (0.00269) | 62.59th | v3 (v2023.03.01) |
| Mar 6, 2023 | 2.69% (0.02686) | 82.85th | v2 (v2022.01.01) |
| Apr 1, 2022 | 2.69% (0.02686) | 81.17th | v2 (v2022.01.01) |
| Feb 4, 2022 | 18.01% (0.18006) | 93.41th | v2 (v2022.01.01) |
| Feb 3, 2022 | 14.63% (0.14629) | 89.77th | v1 |
| Jan 6, 2022 | 14.63% (0.14629) | 89.65th | v1 |
| Jan 5, 2022 | 3.68% (0.03679) | 83.27th | v5 (v2026.06.15) |
| Apr 14, 2021 | 3.68% (0.03679) | 0.00th | v1 |
References (23)
- http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00000.html vendor-advisoryx_refsource_SUSEMailing ListThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00001.html vendor-advisoryx_refsource_SUSEIssue TrackingMailing ListThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00006.html vendor-advisoryx_refsource_SUSEMailing ListThird Party Advisory
- https://access.redhat.com/errata/RHSA-2020:0243 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2020:0466 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2019-11745 Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1586176 x_refsource_CONFIRMIssue TrackingPatchVendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1774831 Issue Tracking
- https://cert-portal.siemens.com/productcert/pdf/ssa-379803.pdf x_refsource_CONFIRMThird Party Advisory
- https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.44.3_release_notes
- https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.47.1_release_notes
- https://lists.debian.org/debian-lts-announce/2020/09/msg00029.html mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2019-11745
- https://security.gentoo.org/glsa/202003-02 vendor-advisoryx_refsource_GENTOOThird Party Advisory
- https://security.gentoo.org/glsa/202003-10 vendor-advisoryx_refsource_GENTOOThird Party Advisory
- https://security.gentoo.org/glsa/202003-37 vendor-advisoryx_refsource_GENTOOThird Party Advisory
- https://us-cert.cisa.gov/ics/advisories/icsa-21-040-04 x_refsource_MISCThird Party AdvisoryUS Government Resource
- https://usn.ubuntu.com/4241-1/ vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- https://usn.ubuntu.com/4335-1/ vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2019-11745
- https://www.mozilla.org/security/advisories/mfsa2019-36/ x_refsource_CONFIRMVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2019-37/ x_refsource_CONFIRMVendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2019-38/ x_refsource_CONFIRMVendor Advisory
Change history (0)
No recorded changes yet.