CVE-2020-36242
CRITICAL
9.1
CVSS Score
Published: February 7, 2021 at 07:50 PM UTC
Updated: June 17, 2026 at 03:15 AM UTC
3 products affected across 3 vendorsFedoraCommunications Cloud Native Core Network Function Cloud Native EnvironmentCryptography
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Severity
CRITICAL9.1
Exploit prediction
EPSS 7%
Description
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.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
v < 3.3.2
Affected range stops below 3.3.2, so it looks safe — our inference, not a vendor statement
95%
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
- https://github.com/pyca/cryptography/compare/3.3.1...3.3.2
- https://github.com/pyca/cryptography/issues/5615
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L7RGQLK4J5ZQFRLKCHVVG6BKZTUQMG7E/
- https://www.oracle.com/security-alerts/cpuapr2022.html
- https://www.oracle.com/security-alerts/cpujul2022.html
References (6)
x_refsource_CONFIRMRelease NotesThird Party Advisory
Source: [email protected]
https://github.com/pyca/cryptography/blob/master/CHANGELOG.rstx_refsource_CONFIRMPatchThird Party Advisory
Source: [email protected]
https://github.com/pyca/cryptography/compare/3.3.1...3.3.2x_refsource_MISCExploitPatchThird Party Advisory
Source: [email protected]
https://github.com/pyca/cryptography/issues/5615Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L7RGQLK4J5ZQFRLKCHVVG6BKZTUQMG7E/x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://www.oracle.com/security-alerts/cpuapr2022.htmlx_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://www.oracle.com/security-alerts/cpujul2022.htmlCVSS
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- HIGH
- Integrity
- NONE
- Availability
- HIGH
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-190CWE-787
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