Buffer overflow in Cryptography.io Cryptography
CVE-2020-36242
In the cryptography package before 3.3.2 for Python, certain sequences of update calls to symmetrically encrypt multi-GB values could result in an integer overflow and buffer overflow, as demonstrated by the Fernet class.
Vulnerability class: Integer Overflow
EPSS: 0.067 (93.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.
Affected products
- Cryptography.io Cryptography
- Oracle Communications_cloud_native_core_network_function_cloud_native_environment — versions 1.10.0
- Fedoraproject Fedora — versions 33
- N/a — versions n/a
Weakness classification (CWE)
Public proof-of-concept exploits
References
- cve@mitre.org (Exploit, Patch, Third Party Advisory, x_refsource_MISC)
- cve@mitre.org (x_refsource_FEDORA, vendor-advisory)
- cve@mitre.org (Patch, Third Party Advisory, x_refsource_MISC)
- cve@mitre.org (x_refsource_CONFIRM, Patch, Third Party Advisory)
- cve@mitre.org (x_refsource_CONFIRM, Third Party Advisory, Release Notes)
- cve@mitre.org (Patch, Third Party Advisory, x_refsource_MISC)
Frequently asked questions
- What is CVE-2020-36242?
- CVE-2020-36242 is a critical-severity vulnerability in Cryptography.io Cryptography, classified under Integer Overflow or Wraparound. CVSS score: 9.1/10. Published 2021-02-07.
- How severe is CVE-2020-36242?
- Critical severity. CVSS v3 base score is 9.1 out of 10.
- Is CVE-2020-36242 known to be exploited?
- 7 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.