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Vulnerability details: VCID-kcuh-65ys-8kfg
Vulnerability ID VCID-kcuh-65ys-8kfg
Aliases CVE-2020-36242
GHSA-rhm9-p9w5-fwm7
PYSEC-2021-63
Summary 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.
Status Published
Exploitability 0.5
Weighted Severity 8.2
Risk 4.1
Affected and Fixed Packages Package Details
Weaknesses (5)
CWE-190 Integer Overflow or Wraparound
CWE-787 Out-of-bounds Write
CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
cvssv3 8.2 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-36242.json
epss 0.00499 https://api.first.org/data/v1/epss?cve=CVE-2020-36242
epss 0.00499 https://api.first.org/data/v1/epss?cve=CVE-2020-36242
epss 0.00499 https://api.first.org/data/v1/epss?cve=CVE-2020-36242
epss 0.01272 https://api.first.org/data/v1/epss?cve=CVE-2020-36242
epss 0.01272 https://api.first.org/data/v1/epss?cve=CVE-2020-36242
epss 0.01272 https://api.first.org/data/v1/epss?cve=CVE-2020-36242
epss 0.01272 https://api.first.org/data/v1/epss?cve=CVE-2020-36242
epss 0.01272 https://api.first.org/data/v1/epss?cve=CVE-2020-36242
epss 0.01272 https://api.first.org/data/v1/epss?cve=CVE-2020-36242
epss 0.01272 https://api.first.org/data/v1/epss?cve=CVE-2020-36242
epss 0.01272 https://api.first.org/data/v1/epss?cve=CVE-2020-36242
epss 0.01272 https://api.first.org/data/v1/epss?cve=CVE-2020-36242
epss 0.01272 https://api.first.org/data/v1/epss?cve=CVE-2020-36242
epss 0.01272 https://api.first.org/data/v1/epss?cve=CVE-2020-36242
epss 0.01272 https://api.first.org/data/v1/epss?cve=CVE-2020-36242
epss 0.01272 https://api.first.org/data/v1/epss?cve=CVE-2020-36242
epss 0.01272 https://api.first.org/data/v1/epss?cve=CVE-2020-36242
epss 0.01272 https://api.first.org/data/v1/epss?cve=CVE-2020-36242
epss 0.01272 https://api.first.org/data/v1/epss?cve=CVE-2020-36242
epss 0.01272 https://api.first.org/data/v1/epss?cve=CVE-2020-36242
epss 0.01272 https://api.first.org/data/v1/epss?cve=CVE-2020-36242
epss 0.01272 https://api.first.org/data/v1/epss?cve=CVE-2020-36242
epss 0.01272 https://api.first.org/data/v1/epss?cve=CVE-2020-36242
epss 0.01272 https://api.first.org/data/v1/epss?cve=CVE-2020-36242
epss 0.01272 https://api.first.org/data/v1/epss?cve=CVE-2020-36242
cvssv3.1 7.5 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv3.1 9.1 https://github.com/advisories/GHSA-rhm9-p9w5-fwm7
cvssv3.1_qr HIGH https://github.com/advisories/GHSA-rhm9-p9w5-fwm7
generic_textual HIGH https://github.com/advisories/GHSA-rhm9-p9w5-fwm7
cvssv3.1 9.1 https://github.com/pyca/cryptography
generic_textual HIGH https://github.com/pyca/cryptography
cvssv3.1 9.1 https://github.com/pyca/cryptography/blob/master/CHANGELOG.rst
generic_textual HIGH https://github.com/pyca/cryptography/blob/master/CHANGELOG.rst
cvssv3.1 9.1 https://github.com/pyca/cryptography/commit/82b6ce28389f0a317bc55ba2091a74b346db7cae
generic_textual HIGH https://github.com/pyca/cryptography/commit/82b6ce28389f0a317bc55ba2091a74b346db7cae
cvssv3.1 9.1 https://github.com/pyca/cryptography/compare/3.3.1...3.3.2
generic_textual HIGH https://github.com/pyca/cryptography/compare/3.3.1...3.3.2
cvssv3.1 9.1 https://github.com/pyca/cryptography/issues/5615
generic_textual HIGH https://github.com/pyca/cryptography/issues/5615
cvssv3.1 9.1 https://github.com/pyca/cryptography/security/advisories/GHSA-rhm9-p9w5-fwm7
cvssv3.1_qr HIGH https://github.com/pyca/cryptography/security/advisories/GHSA-rhm9-p9w5-fwm7
generic_textual HIGH https://github.com/pyca/cryptography/security/advisories/GHSA-rhm9-p9w5-fwm7
cvssv3.1 9.1 https://github.com/pypa/advisory-database/tree/main/vulns/cryptography/PYSEC-2021-63.yaml
generic_textual HIGH https://github.com/pypa/advisory-database/tree/main/vulns/cryptography/PYSEC-2021-63.yaml
cvssv3.1 9.1 https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L7RGQLK4J5ZQFRLKCHVVG6BKZTUQMG7E
generic_textual HIGH https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L7RGQLK4J5ZQFRLKCHVVG6BKZTUQMG7E
cvssv3.1 9.1 https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/L7RGQLK4J5ZQFRLKCHVVG6BKZTUQMG7E
generic_textual HIGH https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/L7RGQLK4J5ZQFRLKCHVVG6BKZTUQMG7E
cvssv2 6.4 https://nvd.nist.gov/vuln/detail/CVE-2020-36242
cvssv3.1 9.1 https://nvd.nist.gov/vuln/detail/CVE-2020-36242
generic_textual HIGH https://nvd.nist.gov/vuln/detail/CVE-2020-36242
archlinux Medium https://security.archlinux.org/AVG-1541
cvssv3.1 9.1 https://www.oracle.com/security-alerts/cpuapr2022.html
generic_textual HIGH https://www.oracle.com/security-alerts/cpuapr2022.html
cvssv3.1 9.1 https://www.oracle.com/security-alerts/cpujul2022.html
generic_textual HIGH https://www.oracle.com/security-alerts/cpujul2022.html
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-36242.json
https://api.first.org/data/v1/epss?cve=CVE-2020-36242
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-36242
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://github.com/advisories/GHSA-rhm9-p9w5-fwm7
https://github.com/pyca/cryptography
https://github.com/pyca/cryptography/blob/master/CHANGELOG.rst
https://github.com/pyca/cryptography/commit/82b6ce28389f0a317bc55ba2091a74b346db7cae
https://github.com/pyca/cryptography/compare/3.3.1...3.3.2
https://github.com/pyca/cryptography/issues/5615
https://github.com/pyca/cryptography/security/advisories/GHSA-rhm9-p9w5-fwm7
https://github.com/pypa/advisory-database/tree/main/vulns/cryptography/PYSEC-2021-63.yaml
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L7RGQLK4J5ZQFRLKCHVVG6BKZTUQMG7E
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L7RGQLK4J5ZQFRLKCHVVG6BKZTUQMG7E/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/L7RGQLK4J5ZQFRLKCHVVG6BKZTUQMG7E
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/L7RGQLK4J5ZQFRLKCHVVG6BKZTUQMG7E/
https://nvd.nist.gov/vuln/detail/CVE-2020-36242
https://www.oracle.com/security-alerts/cpuapr2022.html
https://www.oracle.com/security-alerts/cpujul2022.html
1926226 https://bugzilla.redhat.com/show_bug.cgi?id=1926226
ASA-202102-36 https://security.archlinux.org/ASA-202102-36
AVG-1541 https://security.archlinux.org/AVG-1541
cpe:2.3:a:cryptography.io:cryptography:*:*:*:*:*:python:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:cryptography.io:cryptography:*:*:*:*:*:python:*:*
cpe:2.3:a:oracle:communications_cloud_native_core_network_function_cloud_native_environment:1.10.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:oracle:communications_cloud_native_core_network_function_cloud_native_environment:1.10.0:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
RHSA-2021:1608 https://access.redhat.com/errata/RHSA-2021:1608
RHSA-2021:2239 https://access.redhat.com/errata/RHSA-2021:2239
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-36242.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H Found at https://github.com/advisories/GHSA-rhm9-p9w5-fwm7
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

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unchanged

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H Found at https://github.com/pyca/cryptography
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H Found at https://github.com/pyca/cryptography/blob/master/CHANGELOG.rst
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H Found at https://github.com/pyca/cryptography/commit/82b6ce28389f0a317bc55ba2091a74b346db7cae
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

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none

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H Found at https://github.com/pyca/cryptography/compare/3.3.1...3.3.2
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

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physical

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H Found at https://github.com/pyca/cryptography/issues/5615
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

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physical

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H Found at https://github.com/pyca/cryptography/security/advisories/GHSA-rhm9-p9w5-fwm7
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

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required

unchanged

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none

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none

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H Found at https://github.com/pypa/advisory-database/tree/main/vulns/cryptography/PYSEC-2021-63.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H Found at https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L7RGQLK4J5ZQFRLKCHVVG6BKZTUQMG7E
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

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none

required

unchanged

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high

low

none

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H Found at https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/L7RGQLK4J5ZQFRLKCHVVG6BKZTUQMG7E
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

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Vector: AV:N/AC:L/Au:N/C:P/I:N/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2020-36242
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2020-36242
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

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none

required

unchanged

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high

low

none

high

low

none

high

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none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H Found at https://www.oracle.com/security-alerts/cpuapr2022.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

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none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H Found at https://www.oracle.com/security-alerts/cpujul2022.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

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none

required

unchanged

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high

low

none

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low

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none
Exploit Prediction Scoring System (EPSS)
Percentile 0.65051
EPSS Score 0.00499
Published At Aug. 1, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:10:37.364556+00:00 Pypa Importer Import https://github.com/pypa/advisory-database/blob/main/vulns/cryptography/PYSEC-2021-63.yaml 37.0.0