python: NULL pointer dereference using a specially crafted X509 certificate
Published Oct 31, 2019
7.5
HIGHCVSS 3.1
EPSS 20.74%
Description
An exploitable denial-of-service vulnerability exists in the X509 certificate parser of Python.org Python 2.7.11 / 3.6.6. A specially crafted X509 certificate can cause a NULL pointer dereference, resulting in a denial of service. An attacker can initiate or accept TLS connections using crafted certificates to trigger this vulnerability.
Affected products
- Vendor n/a Product Python Defaultn/a
- Version Python.org CPython 2.7.11 Python.org CPython 3.6.6 Python.org CPython 3.5.2 Python.org CPython 3 master at 480833808e918a1dcebbbcfd07d5a8de3c5c2a66StatusaffectedConstraints-
- 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 | ||||||
|---|---|---|---|---|---|---|---|---|---|
| n/a | Python | n/a |
|
Configuration 1
Configuration 3
- 9.0
Configuration 4
- 8.0
- 8.1
- 8.2
- 8.4
- 8.6
- 8.2
- 8.4
- 8.6
- 8.2
- 8.4
- 8.6
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 7
python-0:2.7.5-86.el7
Fixed · RHSA-2019:2030
Red Hat Enterprise Linux 8
python3-0:3.6.8-15.1.el8
Fixed · RHSA-2019:3520
Red Hat Enterprise Linux 8
python3-0:3.6.8-15.1.el8
Fixed · RHSA-2019:3520
Red Hat Software Collections for Red Hat Enterprise Linux 6
rh-python36-python-0:3.6.9-2.el6
Fixed · RHSA-2019:3725
Red Hat Software Collections for Red Hat Enterprise Linux 7
rh-python36-python-0:3.6.9-2.el7
Fixed · RHSA-2019:3725
Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS
rh-python36-python-0:3.6.9-2.el7
Fixed · RHSA-2019:3725
Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS
rh-python36-python-0:3.6.9-2.el7
Fixed · RHSA-2019:3725
Red Hat Software Collections for Red Hat Enterprise Linux 7.7 EUS
rh-python36-python-0:3.6.9-2.el7
Fixed · RHSA-2019:3725
Red Hat Enterprise Linux 5
python
Not affected
Red Hat Enterprise Linux 6
python
Not affected
Red Hat Enterprise Linux 8
python36:3.6/python36
Not affected
Red Hat Software Collections
rh-python35-python
Will not fix
| 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 7 | python-0:2.7.5-86.el7 | Fixed | RHSA-2019:2030 |
| Red Hat Enterprise Linux 8 | python3-0:3.6.8-15.1.el8 | Fixed | RHSA-2019:3520 |
| Red Hat Enterprise Linux 8 | python3-0:3.6.8-15.1.el8 | Fixed | RHSA-2019:3520 |
| Red Hat Software Collections for Red Hat Enterprise Linux 6 | rh-python36-python-0:3.6.9-2.el6 | Fixed | RHSA-2019:3725 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7 | rh-python36-python-0:3.6.9-2.el7 | Fixed | RHSA-2019:3725 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS | rh-python36-python-0:3.6.9-2.el7 | Fixed | RHSA-2019:3725 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS | rh-python36-python-0:3.6.9-2.el7 | Fixed | RHSA-2019:3725 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.7 EUS | rh-python36-python-0:3.6.9-2.el7 | Fixed | RHSA-2019:3725 |
| Red Hat Enterprise Linux 5 | python | Not affected | n/a |
| Red Hat Enterprise Linux 6 | python | Not affected | n/a |
| Red Hat Enterprise Linux 8 | python36:3.6/python36 | Not affected | n/a |
| Red Hat Software Collections | rh-python35-python | Will not fix | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue did not affect the versions of python as shipped with Red Hat Enterprise Linux 5 and 6.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
1 other source (CVE.org) ▾
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
AV:N/AC:L/Au:N/C:N/I:N/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 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (59 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 20.74% (0.20743) | 97.47th | v5 (v2026.06.15) |
| Jun 15, 2026 | 20.74% (0.20743) | 97.21th | v5 (v2026.06.15) |
| Apr 7, 2026 | 5.36% (0.05355) | 90.06th | v4 (v2025.03.14) |
| Apr 6, 2026 | 7.67% (0.07673) | 91.88th | v4 (v2025.03.14) |
| Mar 4, 2026 | 6.01% (0.06010) | 90.53th | v4 (v2025.03.14) |
| Mar 1, 2026 | 1.79% (0.01790) | 82.53th | v4 (v2025.03.14) |
| Feb 4, 2026 | 6.01% (0.06010) | 90.47th | v4 (v2025.03.14) |
| Feb 1, 2026 | 1.79% (0.01790) | 82.41th | v4 (v2025.03.14) |
| Jan 4, 2026 | 6.01% (0.06010) | 90.40th | v4 (v2025.03.14) |
| Jan 1, 2026 | 1.79% (0.01790) | 82.36th | v4 (v2025.03.14) |
| Dec 28, 2025 | 6.01% (0.06010) | 90.39th | v4 (v2025.03.14) |
| Dec 27, 2025 | 4.54% (0.04543) | 88.87th | v4 (v2025.03.14) |
| Dec 18, 2025 | 6.17% (0.06165) | 90.48th | v4 (v2025.03.14) |
| Dec 4, 2025 | 3.67% (0.03673) | 87.47th | v4 (v2025.03.14) |
| Dec 1, 2025 | 1.00% (0.01002) | 76.44th | v4 (v2025.03.14) |
| Nov 21, 2025 | 3.77% (0.03771) | 87.57th | v4 (v2025.03.14) |
| Nov 18, 2025 | 23.27% (0.23267) | 95.58th | v4 (v2025.03.14) |
| Nov 4, 2025 | 3.67% (0.03673) | 87.39th | v4 (v2025.03.14) |
| Nov 1, 2025 | 1.00% (0.01002) | 76.41th | v4 (v2025.03.14) |
| Oct 4, 2025 | 3.67% (0.03673) | 87.41th | v4 (v2025.03.14) |
| Oct 1, 2025 | 1.00% (0.01002) | 76.32th | v4 (v2025.03.14) |
| Sep 4, 2025 | 3.56% (0.03561) | 87.27th | v4 (v2025.03.14) |
| Sep 1, 2025 | 1.31% (0.01313) | 79.11th | v4 (v2025.03.14) |
| Aug 30, 2025 | 3.56% (0.03561) | 87.26th | v4 (v2025.03.14) |
| Aug 5, 2025 | 2.44% (0.02441) | 84.55th | v4 (v2025.03.14) |
| Aug 1, 2025 | 0.88% (0.00877) | 74.49th | v4 (v2025.03.14) |
| Jul 30, 2025 | 2.44% (0.02441) | 84.55th | v4 (v2025.03.14) |
| Jul 4, 2025 | 3.65% (0.03652) | 87.38th | v4 (v2025.03.14) |
| Jul 1, 2025 | 1.33% (0.01326) | 79.04th | v4 (v2025.03.14) |
| Jun 5, 2025 | 3.65% (0.03652) | 87.28th | v4 (v2025.03.14) |
| Jun 1, 2025 | 1.33% (0.01326) | 78.99th | v4 (v2025.03.14) |
| May 4, 2025 | 3.65% (0.03652) | 87.22th | v4 (v2025.03.14) |
| May 1, 2025 | 1.33% (0.01326) | 78.90th | v4 (v2025.03.14) |
| Apr 19, 2025 | 3.65% (0.03652) | 87.22th | v4 (v2025.03.14) |
| Apr 18, 2025 | 1.33% (0.01326) | 78.82th | v4 (v2025.03.14) |
| Apr 10, 2025 | 3.65% (0.03652) | 86.83th | v4 (v2025.03.14) |
| Apr 9, 2025 | 1.33% (0.01326) | 78.22th | v4 (v2025.03.14) |
| Apr 2, 2025 | 3.65% (0.03652) | 86.80th | v4 (v2025.03.14) |
| Apr 1, 2025 | 1.33% (0.01326) | 78.15th | v4 (v2025.03.14) |
| Mar 30, 2025 | 3.65% (0.03652) | 86.76th | v4 (v2025.03.14) |
| Mar 29, 2025 | 15.68% (0.15676) | 91.21th | v4 (v2025.03.14) |
| Mar 28, 2025 | 3.65% (0.03652) | 86.78th | v4 (v2025.03.14) |
| Mar 27, 2025 | 15.68% (0.15676) | 93.79th | v4 (v2025.03.14) |
| Mar 20, 2025 | 3.65% (0.03652) | 86.86th | v4 (v2025.03.14) |
| Mar 19, 2025 | 15.68% (0.15676) | 93.90th | v4 (v2025.03.14) |
| Mar 17, 2025 | 1.33% (0.01326) | 78.57th | v4 (v2025.03.14) |
| Dec 12, 2024 | 1.71% (0.01715) | 88.31th | v3 (v2023.03.01) |
| Feb 24, 2024 | 1.85% (0.01845) | 87.93th | v3 (v2023.03.01) |
| Nov 8, 2023 | 2.59% (0.02593) | 89.12th | v3 (v2023.03.01) |
| Oct 7, 2023 | 3.35% (0.03345) | 90.21th | v3 (v2023.03.01) |
| Sep 21, 2023 | 2.94% (0.02944) | 89.62th | v3 (v2023.03.01) |
| Mar 7, 2023 | 3.06% (0.03061) | 89.45th | v3 (v2023.03.01) |
| Mar 6, 2023 | 19.17% (0.19173) | 96.36th | v2 (v2022.01.01) |
| Apr 1, 2022 | 19.17% (0.19173) | 96.03th | v2 (v2022.01.01) |
| Feb 4, 2022 | 19.17% (0.19173) | 93.71th | v2 (v2022.01.01) |
| Feb 3, 2022 | 9.61% (0.09608) | 87.22th | v1 |
| Jan 6, 2022 | 9.61% (0.09608) | 87.07th | v1 |
| Sep 1, 2021 | 9.61% (0.09608) | 94.88th | v1 |
| Apr 14, 2021 | 9.61% (0.09608) | 0.00th | v1 |
References (13)
- http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00040.html vendor-advisoryx_refsource_SUSEMailing ListThird Party Advisory
- https://access.redhat.com/errata/RHSA-2019:3520 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/errata/RHSA-2019:3725 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2019-5010 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1666519 Issue Tracking
- https://lists.apache.org/thread.html/r1b103833cb5bc8466e24ff0ecc5e75b45a705334ab6a444e64e840a0%40%3Cissues.bookkeeper.apache.org%3E mailing-listx_refsource_MLIST
- https://lists.debian.org/debian-lts-announce/2020/07/msg00011.html mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/08/msg00034.html mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2019-5010
- https://python-security.readthedocs.io/vuln/ssl-crl-dps-dos.html
- https://security.gentoo.org/glsa/202003-26 vendor-advisoryx_refsource_GENTOOThird Party Advisory
- https://talosintelligence.com/vulnerability_reports/TALOS-2019-0758 x_refsource_MISCExploitThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2019-5010
Change history (0)
No recorded changes yet.