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CVE-2016-0772

UnknownEPSS 14.52%

Last modified

CVE-2016-0772 is a vulnerability of currently unknown severity. The smtplib library in CPython (aka Python) before 2.7.12, 3.x before 3.4.5, and 3.5.x before 3.5.2 does not return an error when StartTLS fails, which might allow man-in-the-middle attackers to bypass the TLS protections by leveraging a network position between the client and the registry to block the StartTLS command, aka a "StartTLS stripping attack.". EPSS estimates a 14.52% chance of exploitation in the next 30 days.

Description

The smtplib library in CPython (aka Python) before 2.7.12, 3.x before 3.4.5, and 3.5.x before 3.5.2 does not return an error when StartTLS fails, which might allow man-in-the-middle attackers to bypass the TLS protections by leveraging a network position between the client and the registry to block the StartTLS command, aka a "StartTLS stripping attack."

Metrics

EPSS Probability
14.52%

96.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
PythonPython3.5.0
PythonPython3.5.1
PythonPython3.0
PythonPython3.0.1
PythonPython3.1.0
PythonPython3.1.1
PythonPython3.1.2
PythonPython3.1.3
PythonPython3.1.4
PythonPython3.1.5
PythonPython3.2.0
PythonPython3.2.1
PythonPython3.2.2
PythonPython3.2.3
PythonPython3.2.4
PythonPython3.2.5
PythonPython3.2.6
PythonPython3.3.0
PythonPython3.3.1
PythonPython3.3.2
PythonPython3.3.3
PythonPython3.3.4
PythonPython3.3.5
PythonPython3.3.6
PythonPython3.4.0
PythonPython3.4.1
PythonPython3.4.2
PythonPython3.4.3
PythonPython3.4.4
PythonPython<= 2.7.11

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2016-0772?
The smtplib library in CPython (aka Python) before 2.7.12, 3.x before 3.4.5, and 3.5.x before 3.5.2 does not return an error when StartTLS fails, which might allow man-in-the-middle attackers to bypass the TLS protections by leveraging a network position between the client and the registry to block the StartTLS command, aka a "StartTLS stripping attack."
How severe is CVE-2016-0772?
Severity scoring for CVE-2016-0772 is pending analysis. The EPSS model estimates a 14.52% probability of exploitation in the next 30 days.
How do I fix CVE-2016-0772?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2016-0772?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST