01 Record

CVE-2019-9947

An issue was discovered in urllib2 in Python 2.x through 2.7.16 and urllib in Python 3.x through 3.7.3. CRLF injection is possible if the attacker controls a url parameter, as demonstrated by the

MediumPUBLISHEDCNA: mitre

CNA base score5.4 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

View raw JSON

02 Description

An issue was discovered in urllib2 in Python 2.x through 2.7.16 and urllib in Python 3.x through 3.7.3. CRLF injection is possible if the attacker controls a url parameter, as demonstrated by the

03 Exploitation and scoring

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

5.25% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 92.5% of scored records. A rank, not a probability.

NVD base score

6.1 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-10-14.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2019-03-23 17:06Z7 YR AGO

Last updated

2026-10-14 06:49Z15 DAYS AGO

Reserved

2019-03-23

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Medium (CVSS 5.4)

CNA CVSS vector

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

Weaknesses

CWE-93Improper Neutralization of CRLF Sequences ('CRLF Injection')Base
CWE-113Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')Variant

Data version

5.2

Document digest

97901bbd3d3abcfdc8694a564473c3299f9207f3f6dc498bc350581698afcbc2

05 Affected products

VendorProductVersionsPlatforms

pythonpythonNot specified—

redhatansible_towerNot specified—

redhatenterprise_linuxNot specified—

redhatrhel_ausNot specified—

redhatrhel_e4sNot specified—

redhatrhel_eusNot specified—

redhatrhel_software_collectionsNot specified—

redhatrhel_tusNot specified—

06 References

bugs.python.orghttps://bugs.python.org/issue35906x_refsource_MISC
security.netapp.comhttps://security.netapp.com/advisory/ntap-20190404-0004/x_refsource_CONFIRM
lists.fedoraproject.orgFEDORA-2019-1ffd6b6064https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JXASHCDD4PQFKTMKQN4YOP5ZH366ABN4/vendor-advisoryx_refsource_FEDORA
access.redhat.comRHSA-2019:1260https://access.redhat.com/errata/RHSA-2019:1260vendor-advisoryx_refsource_REDHAT
lists.fedoraproject.orgFEDORA-2019-ec26883852https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JMWSKTNOHSUOT3L25QFJAVCFYZX46FYK/vendor-advisoryx_refsource_FEDORA
lists.debian.org[debian-lts-announce] 20190625 [SECURITY] [DLA 1834-1] python2.7 security updatehttps://lists.debian.org/debian-lts-announce/2019/06/msg00022.htmlmailing-listx_refsource_MLIST
lists.debian.org[debian-lts-announce] 20190625 [SECURITY] [DLA 1835-1] python3.4 security updatehttps://lists.debian.org/debian-lts-announce/2019/06/msg00023.htmlmailing-listx_refsource_MLIST
lists.debian.org[debian-lts-announce] 20190625 [SECURITY] [DLA 1835-2] python3.4 regression updatehttps://lists.debian.org/debian-lts-announce/2019/06/msg00026.htmlmailing-listx_refsource_MLIST
access.redhat.comRHSA-2019:2030https://access.redhat.com/errata/RHSA-2019:2030vendor-advisoryx_refsource_REDHAT
usn.ubuntu.comUSN-4127-2https://usn.ubuntu.com/4127-2/vendor-advisoryx_refsource_UBUNTU
usn.ubuntu.comUSN-4127-1https://usn.ubuntu.com/4127-1/vendor-advisoryx_refsource_UBUNTU
lists.opensuse.orgopenSUSE-SU-2019:2389http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00062.htmlvendor-advisoryx_refsource_SUSE
lists.opensuse.orgopenSUSE-SU-2019:2393http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00063.htmlvendor-advisoryx_refsource_SUSE
access.redhat.comRHSA-2019:3335https://access.redhat.com/errata/RHSA-2019:3335vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2019:3520https://access.redhat.com/errata/RHSA-2019:3520vendor-advisoryx_refsource_REDHAT
access.redhat.comRHSA-2019:3725https://access.redhat.com/errata/RHSA-2019:3725vendor-advisoryx_refsource_REDHAT
lists.opensuse.orgopenSUSE-SU-2020:0086http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00040.htmlvendor-advisoryx_refsource_SUSE
security.gentoo.orgGLSA-202003-26https://security.gentoo.org/glsa/202003-26vendor-advisoryx_refsource_GENTOO
lists.debian.org[debian-lts-announce] 20200715 [SECURITY] [DLA 2280-1] python3.5 security updatehttps://lists.debian.org/debian-lts-announce/2020/07/msg00011.htmlmailing-listx_refsource_MLIST
lists.debian.org[debian-lts-announce] 20200822 [SECURITY] [DLA 2337-1] python2.7 security updatehttps://lists.debian.org/debian-lts-announce/2020/08/msg00034.htmlmailing-listx_refsource_MLIST
www.openwall.com[oss-security] 20210204 [CVE-2020-15693, CVE-2020-15694] Nim - stdlib Httpclient - Header Crlf Injection & Server Response Validationhttp://www.openwall.com/lists/oss-security/2021/02/04/2mailing-listx_refsource_MLIST
cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/html/ssa-398330.html

07 Fixed in

AlmaLinux 8

python-psycopg2-doc
Fixed in 2.7.5-7.module_el8.6.0+2781+fed64c13
python2-Cython
Fixed in 0.28.1-7.module_el8.6.0+2781+fed64c13
python2-PyMySQL
Fixed in 0.8.0-10.module_el8.6.0+2781+fed64c13
python2-attrs
Fixed in 17.4.0-10.module_el8.6.0+2781+fed64c13
python2-chardet
Fixed in 3.0.4-10.module_el8.6.0+2781+fed64c13
python2-coverage
Fixed in 4.5.1-4.module_el8.6.0+2781+fed64c13
python2-dns
Fixed in 1.15.0-10.module_el8.6.0+2781+fed64c13
python2-docs
Fixed in 2.7.16-2.module_el8.6.0+2781+fed64c13
python2-docs-info
Fixed in 2.7.16-2.module_el8.6.0+2781+fed64c13
python2-docutils
Fixed in 0.14-12.module_el8.6.0+2781+fed64c13
python2-funcsigs
Fixed in 1.0.2-13.module_el8.6.0+2781+fed64c13
python2-idna
Fixed in 2.5-7.module_el8.6.0+2781+fed64c13
python2-ipaddress
Fixed in 1.0.18-6.module_el8.6.0+2781+fed64c13
python2-markupsafe
Fixed in 0.23-19.module_el8.6.0+2781+fed64c13
python2-mock
Fixed in 2.0.0-13.module_el8.6.0+2781+fed64c13
python2-pluggy
Fixed in 0.6.0-8.module_el8.6.0+2781+fed64c13
python2-psycopg2
Fixed in 2.7.5-7.module_el8.6.0+2781+fed64c13
python2-psycopg2-debug
Fixed in 2.7.5-7.module_el8.6.0+2781+fed64c13
python2-psycopg2-tests
Fixed in 2.7.5-7.module_el8.6.0+2781+fed64c13
python2-py
Fixed in 1.5.3-6.module_el8.6.0+2781+fed64c13
python2-pysocks
Fixed in 1.6.8-6.module_el8.6.0+2781+fed64c13
python2-pytest
Fixed in 3.4.2-13.module_el8.6.0+2781+fed64c13
python2-pytest-mock
Fixed in 1.9.0-4.module_el8.6.0+2781+fed64c13
python2-pytz
Fixed in 2017.2-12.module_el8.6.0+2781+fed64c13
python2-pyyaml
Fixed in 3.12-16.module_el8.6.0+2781+fed64c13
python2-rpm-macros
Fixed in 3-38.module_el8.6.0+2781+fed64c13
python2-setuptools_scm
Fixed in 1.15.7-6.module_el8.6.0+2781+fed64c13

CloudLinux 8

python-psycopg2-doc
Fixed in 2.7.5-7.module_el8.6.0+2781+fed64c13
python2-Cython
Fixed in 0.28.1-7.module_el8.6.0+2781+fed64c13
python2-PyMySQL
Fixed in 0.8.0-10.module_el8.6.0+2781+fed64c13
python2-attrs
Fixed in 17.4.0-10.module_el8.6.0+2781+fed64c13
python2-chardet
Fixed in 3.0.4-10.module_el8.6.0+2781+fed64c13
python2-coverage
Fixed in 4.5.1-4.module_el8.6.0+2781+fed64c13
python2-dns
Fixed in 1.15.0-10.module_el8.6.0+2781+fed64c13
python2-docs
Fixed in 2.7.16-2.module_el8.6.0+2781+fed64c13
python2-docs-info
Fixed in 2.7.16-2.module_el8.6.0+2781+fed64c13
python2-docutils
Fixed in 0.14-12.module_el8.6.0+2781+fed64c13
python2-funcsigs
Fixed in 1.0.2-13.module_el8.6.0+2781+fed64c13
python2-idna
Fixed in 2.5-7.module_el8.6.0+2781+fed64c13
python2-ipaddress
Fixed in 1.0.18-6.module_el8.6.0+2781+fed64c13
python2-markupsafe
Fixed in 0.23-19.module_el8.6.0+2781+fed64c13
python2-mock
Fixed in 2.0.0-13.module_el8.6.0+2781+fed64c13
python2-pluggy
Fixed in 0.6.0-8.module_el8.6.0+2781+fed64c13
python2-psycopg2
Fixed in 2.7.5-7.module_el8.6.0+2781+fed64c13
python2-psycopg2-debug
Fixed in 2.7.5-7.module_el8.6.0+2781+fed64c13
python2-psycopg2-tests
Fixed in 2.7.5-7.module_el8.6.0+2781+fed64c13
python2-py
Fixed in 1.5.3-6.module_el8.6.0+2781+fed64c13
python2-pysocks
Fixed in 1.6.8-6.module_el8.6.0+2781+fed64c13
python2-pytest
Fixed in 3.4.2-13.module_el8.6.0+2781+fed64c13
python2-pytest-mock
Fixed in 1.9.0-4.module_el8.6.0+2781+fed64c13
python2-pytz
Fixed in 2017.2-12.module_el8.6.0+2781+fed64c13
python2-pyyaml
Fixed in 3.12-16.module_el8.6.0+2781+fed64c13
python2-rpm-macros
Fixed in 3-38.module_el8.6.0+2781+fed64c13
python2-setuptools_scm
Fixed in 1.15.7-6.module_el8.6.0+2781+fed64c13

Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.

Debian 11

python2.7
Fixed in 2.7.16-3

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 16.04 LTS

python2.7
Fixed in 2.7.12-1ubuntu0~16.04.8
python3.5
Fixed in 3.5.2-2ubuntu0~16.04.8

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 18.04 LTS

python2.7
Fixed in 2.7.15-4ubuntu4~18.04.1
python3.6
Fixed in 3.6.8-1~18.04.2

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 14.04 LTS

python2.7
Fixed in 2.7.6-8ubuntu0.6+esm2
Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
python3.4
Fixed in 3.4.3-1ubuntu1~14.04.7+esm2
Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
python3.5
Fixed in 3.5.2-2ubuntu0~16.04.4~14.04.1+esm1
Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.