CVE-2019-9947

MEDIUMEPSS 92th pctl

6.1

CVSS v3

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 first argument to urllib.request.urlopen with \r\n (specifically in the path component of a URL that lacks a ? character) followed by an HTTP header or a Redis command. This is similar to the CVE-2019-9740 query string issue. This is fixed in: v2.7.17, v2.7.17rc1, v2.7.18, v2.7.18rc1; v3.5.10, v3.5.10rc1, v3.5.8, v3.5.8rc1, v3.5.8rc2, v3.5.9; v3.6.10, v3.6.10rc1, v3.6.11, v3.6.11rc1, v3.6.12, v3.6.9, v3.6.9rc1; v3.7.4, v3.7.4rc1, v3.7.4rc2, v3.7.5, v3.7.5rc1, v3.7.6, v3.7.6rc1, v3.7.7, v3.7.7rc1, v3.7.8, v3.7.8rc1, v3.7.9.

CWE-93

How to fix

Remediation Available

python3Amazon

Fixed in:0:3.7.3-1.amzn2.0.2

python3-debugAmazon

Fixed in:0:3.7.3-1.amzn2.0.2

python3-debuginfoAmazon

Fixed in:0:3.7.3-1.amzn2.0.2

python3-develAmazon

Fixed in:0:3.7.3-1.amzn2.0.2

python3-libsAmazon

Fixed in:0:3.7.3-1.amzn2.0.2

python3-testAmazon

Fixed in:0:3.7.3-1.amzn2.0.2

python3-tkinterAmazon

Fixed in:0:3.7.3-1.amzn2.0.2

python3-toolsAmazon

Fixed in:0:3.7.3-1.amzn2.0.2

python2.7Debian

Fixed in:2.7.16-3CVE-2019-9947

This Debian release reached end-of-life on 2024-08-14.

python2.7Ubuntu

Fixed in:2.7.6-8ubuntu0.6+esm2USN-4127-2

This Ubuntu release reached end-of-life on 2019-04-02.

Fixed in:2.7.12-1ubuntu0~16.04.8USN-4127-1

This Ubuntu release reached end-of-life on 2021-04-02.

Fixed in:2.7.15-4ubuntu4~18.04.1USN-4127-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

python2.7-minimalUbuntu

Fixed in:2.7.6-8ubuntu0.6+esm2USN-4127-2

This Ubuntu release reached end-of-life on 2019-04-02.

Fixed in:2.7.12-1ubuntu0~16.04.8USN-4127-1

This Ubuntu release reached end-of-life on 2021-04-02.

Fixed in:2.7.15-4ubuntu4~18.04.1USN-4127-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

python3.10Ubuntu

Fixed in:3.10.12-1~22.04.4USN-6891-1

python3.10-minimalUbuntu

Fixed in:3.10.12-1~22.04.4USN-6891-1

python3.11Ubuntu

Fixed in:3.11.0~rc1-1~22.04.1~esm1USN-6891-1

Fixed in:3.11.6-3ubuntu0.1USN-6891-1

This Ubuntu release reached end-of-life on 2024-07-12.

python3.11-minimalUbuntu

Fixed in:3.11.0~rc1-1~22.04.1~esm1USN-6891-1

Fixed in:3.11.6-3ubuntu0.1USN-6891-1

This Ubuntu release reached end-of-life on 2024-07-12.

python3.12Ubuntu

Fixed in:3.12.0-1ubuntu0.1USN-6891-1

This Ubuntu release reached end-of-life on 2024-07-12.

python3.12-minimalUbuntu

Fixed in:3.12.0-1ubuntu0.1USN-6891-1

This Ubuntu release reached end-of-life on 2024-07-12.

python3.4Ubuntu

Fixed in:3.4.3-1ubuntu1~14.04.7+esm2USN-4127-2

This Ubuntu release reached end-of-life on 2019-04-02.

python3.4-minimalUbuntu

Fixed in:3.4.3-1ubuntu1~14.04.7+esm2USN-4127-2

This Ubuntu release reached end-of-life on 2019-04-02.

python3.5Ubuntu

Fixed in:3.5.2-2ubuntu0~16.04.4~14.04.1+esm1USN-6891-1

This Ubuntu release reached end-of-life on 2019-04-02.

Fixed in:3.5.2-2ubuntu0~16.04.13+esm13USN-6891-1

This Ubuntu release reached end-of-life on 2021-04-02.

Fixed in:3.5.2-2ubuntu0~16.04.8USN-4127-1

This Ubuntu release reached end-of-life on 2021-04-02.

python3.5-minimalUbuntu

Fixed in:3.5.2-2ubuntu0~16.04.4~14.04.1+esm1USN-6891-1

This Ubuntu release reached end-of-life on 2019-04-02.

Fixed in:3.5.2-2ubuntu0~16.04.8USN-4127-1

This Ubuntu release reached end-of-life on 2021-04-02.

Fixed in:3.5.2-2ubuntu0~16.04.13+esm13USN-6891-1

This Ubuntu release reached end-of-life on 2021-04-02.

python3.6Ubuntu

Fixed in:3.6.9-1~18.04ubuntu1.13+esm2USN-6891-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

Fixed in:3.6.8-1~18.04.2USN-4127-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

python3.6-minimalUbuntu

Fixed in:3.6.9-1~18.04ubuntu1.13+esm2USN-6891-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

Fixed in:3.6.8-1~18.04.2USN-4127-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

python3.7Ubuntu

Fixed in:3.7.5-2ubuntu1~18.04.2+esm3USN-6891-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

python3.7-minimalUbuntu

Fixed in:3.7.5-2ubuntu1~18.04.2+esm3USN-6891-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

python3.8Ubuntu

Fixed in:3.8.0-3ubuntu1~18.04.2+esm2USN-6891-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

Fixed in:3.8.10-0ubuntu1~20.04.10USN-6891-1

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

python3.8-minimalUbuntu

Fixed in:3.8.0-3ubuntu1~18.04.2+esm2USN-6891-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

Fixed in:3.8.10-0ubuntu1~20.04.10USN-6891-1

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

python3.9Ubuntu

Fixed in:3.9.5-3ubuntu0~20.04.1+esm2USN-6891-1

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

python3.9-minimalUbuntu

Fixed in:3.9.5-3ubuntu0~20.04.1+esm2USN-6891-1

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

Python 2Windows application

Affected:2.7.0 2.7.17Fixed in:2.7.17Python Software Foundation

Affected:3.7.0 3.7.4Fixed in:3.7.4Python Software Foundation

Affected:3.6.0 3.6.9Fixed in:3.6.9Python Software Foundation

Affected:3.5.0 3.5.8Fixed in:3.5.8Python Software Foundation

This vulnerability affects an unusually large number of packages. The highest-confidence fixes are shown above; the full list is longer. Check the referenced advisories for complete coverage.

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeChanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

5.25%probability of exploitation in 30 days

92ndpercentile

High risk: more likely to be exploited than 92% of all known CVEs.

References

Related Vulnerabilities

Other CWE-93 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-61884	High	7.5	96%	KEV + Ransom	-
CVE-2022-0666	High	7.5	44%	-	Fix
CVE-2016-3115	Medium	6.4	37%	-	Fix
CVE-2024-20337	High	8.2	30%	-	Fix
CVE-2021-39172	High	8.8	29%	-	Fix
CVE-2016-4975	Medium	6.1	20%	-	Fix

Common questions

How do I fix CVE-2019-9947?

Published advisories record a fix for 35 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2019-9947 being actively exploited?

Not that we know of. CVE-2019-9947 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 5.3% is the estimated probability that it will be exploited in the next 30 days. That is higher than 92% of all scored CVEs.

How severe is CVE-2019-9947?

CVE-2019-9947 has a CVSS v3 base score of 6.1, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2019-9947 affect?

Published advisories record a fix for python3 (Amazon), python3-debug (Amazon), python3-debuginfo (Amazon), python3-devel (Amazon), and 31 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-17.