Is CVE-2019-9947 being actively exploited?

It is not currently in CISA's KEV catalog. Its EPSS exploitation probability is 5%.

What products does CVE-2019-9947 affect?

Tracked products affected include Python. Check the version you run to see whether it is affected.

How do I fix CVE-2019-9947?

Apply the vendor fix in your normal patch cycle. Upgrade affected products to a fixed version.

CVE-2019-9947

Q: What is CVE-2019-9947?

CVE-2019-9947 is a medium-severity software vulnerability (CWE-93) with a CVSS score of 6.1. 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 wit

MEDIUM severity · CVSS 6.1 · CWE-93

6.1CVSS MEDIUM

Summary

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.

Impact & exploitability

Attack vectorNetwork

Attack complexityLow

Privileges requiredNone

User interactionRequired

Confidentiality impactLow

Integrity impactLow

Availability impactNone

Exploit probability (EPSS)5%

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

Affected products we track (1)

Python

Recommendation

Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.

CVE-2019-9947

Summary

Impact & exploitability

Affected products we track (1)

Recommendation

Additional information