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Vulnerability details: VCID-g16w-7n3v-a3em
Vulnerability ID VCID-g16w-7n3v-a3em
Aliases CVE-2020-25659
GHSA-hggm-jpg3-v476
PYSEC-2021-62
Summary python-cryptography 3.2 is vulnerable to Bleichenbacher timing attacks in the RSA decryption API, via timed processing of valid PKCS#1 v1.5 ciphertext.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-385 Covert Timing Channel
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 5.9 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-25659.json
epss 0.00252 https://api.first.org/data/v1/epss?cve=CVE-2020-25659
epss 0.00252 https://api.first.org/data/v1/epss?cve=CVE-2020-25659
epss 0.00252 https://api.first.org/data/v1/epss?cve=CVE-2020-25659
epss 0.00252 https://api.first.org/data/v1/epss?cve=CVE-2020-25659
epss 0.00252 https://api.first.org/data/v1/epss?cve=CVE-2020-25659
epss 0.00252 https://api.first.org/data/v1/epss?cve=CVE-2020-25659
epss 0.00252 https://api.first.org/data/v1/epss?cve=CVE-2020-25659
epss 0.00252 https://api.first.org/data/v1/epss?cve=CVE-2020-25659
epss 0.00252 https://api.first.org/data/v1/epss?cve=CVE-2020-25659
epss 0.00252 https://api.first.org/data/v1/epss?cve=CVE-2020-25659
epss 0.00252 https://api.first.org/data/v1/epss?cve=CVE-2020-25659
epss 0.00252 https://api.first.org/data/v1/epss?cve=CVE-2020-25659
epss 0.00252 https://api.first.org/data/v1/epss?cve=CVE-2020-25659
epss 0.00252 https://api.first.org/data/v1/epss?cve=CVE-2020-25659
epss 0.00252 https://api.first.org/data/v1/epss?cve=CVE-2020-25659
epss 0.00252 https://api.first.org/data/v1/epss?cve=CVE-2020-25659
epss 0.00252 https://api.first.org/data/v1/epss?cve=CVE-2020-25659
epss 0.00252 https://api.first.org/data/v1/epss?cve=CVE-2020-25659
epss 0.00252 https://api.first.org/data/v1/epss?cve=CVE-2020-25659
epss 0.00252 https://api.first.org/data/v1/epss?cve=CVE-2020-25659
epss 0.00252 https://api.first.org/data/v1/epss?cve=CVE-2020-25659
epss 0.00252 https://api.first.org/data/v1/epss?cve=CVE-2020-25659
epss 0.00252 https://api.first.org/data/v1/epss?cve=CVE-2020-25659
epss 0.00252 https://api.first.org/data/v1/epss?cve=CVE-2020-25659
epss 0.00252 https://api.first.org/data/v1/epss?cve=CVE-2020-25659
epss 0.00252 https://api.first.org/data/v1/epss?cve=CVE-2020-25659
epss 0.00252 https://api.first.org/data/v1/epss?cve=CVE-2020-25659
epss 0.0026 https://api.first.org/data/v1/epss?cve=CVE-2020-25659
epss 0.0026 https://api.first.org/data/v1/epss?cve=CVE-2020-25659
cvssv3.1 5.9 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv3.1 5.9 https://github.com/advisories/GHSA-hggm-jpg3-v476
cvssv3.1_qr HIGH https://github.com/advisories/GHSA-hggm-jpg3-v476
generic_textual HIGH https://github.com/advisories/GHSA-hggm-jpg3-v476
cvssv3.1 5.9 https://github.com/pyca/cryptography
generic_textual HIGH https://github.com/pyca/cryptography
cvssv3.1 5.9 https://github.com/pyca/cryptography/commit/58494b41d6ecb0f56b7c5f05d5f5e3ca0320d494
generic_textual HIGH https://github.com/pyca/cryptography/commit/58494b41d6ecb0f56b7c5f05d5f5e3ca0320d494
cvssv3.1 5.9 https://github.com/pyca/cryptography/pull/5507
generic_textual HIGH https://github.com/pyca/cryptography/pull/5507
cvssv3.1 5.9 https://github.com/pyca/cryptography/security/advisories/GHSA-hggm-jpg3-v476
cvssv3.1_qr HIGH https://github.com/pyca/cryptography/security/advisories/GHSA-hggm-jpg3-v476
generic_textual HIGH https://github.com/pyca/cryptography/security/advisories/GHSA-hggm-jpg3-v476
cvssv3.1 5.9 https://github.com/pypa/advisory-database/tree/main/vulns/cryptography/PYSEC-2021-62.yaml
generic_textual HIGH https://github.com/pypa/advisory-database/tree/main/vulns/cryptography/PYSEC-2021-62.yaml
cvssv2 4.3 https://nvd.nist.gov/vuln/detail/CVE-2020-25659
cvssv3.1 5.9 https://nvd.nist.gov/vuln/detail/CVE-2020-25659
generic_textual HIGH https://nvd.nist.gov/vuln/detail/CVE-2020-25659
cvssv3.1 5.9 https://pypi.org/project/cryptography
generic_textual HIGH https://pypi.org/project/cryptography
cvssv3.1 5.9 https://www.oracle.com/security-alerts/cpuapr2022.html
generic_textual HIGH https://www.oracle.com/security-alerts/cpuapr2022.html
cvssv3.1 5.9 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-2020-25659.json
https://api.first.org/data/v1/epss?cve=CVE-2020-25659
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-25659
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://github.com/advisories/GHSA-hggm-jpg3-v476
https://github.com/pyca/cryptography
https://github.com/pyca/cryptography/commit/58494b41d6ecb0f56b7c5f05d5f5e3ca0320d494
https://github.com/pyca/cryptography/pull/5507
https://github.com/pyca/cryptography/pull/5507/commits/ce1bef6f1ee06ac497ca0c837fbd1c7ef6c2472b
https://github.com/pyca/cryptography/security/advisories/GHSA-hggm-jpg3-v476
https://github.com/pypa/advisory-database/tree/main/vulns/cryptography/PYSEC-2021-62.yaml
https://nvd.nist.gov/vuln/detail/CVE-2020-25659
https://pypi.org/project/cryptography
https://www.oracle.com/security-alerts/cpuapr2022.html
https://www.oracle.com/security-alerts/cpujul2022.html
1889988 https://bugzilla.redhat.com/show_bug.cgi?id=1889988
973247 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=973247
cpe:2.3:a:cryptography.io:cryptography:3.2:*:*:*:*:python:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:cryptography.io:cryptography:3.2:*:*:*:*: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:*:*:*:*:*:*:*
RHSA-2021:1608 https://access.redhat.com/errata/RHSA-2021:1608
RHSA-2021:2239 https://access.redhat.com/errata/RHSA-2021:2239
USN-4613-1 https://usn.ubuntu.com/4613-1/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-25659.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

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N 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)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N Found at https://github.com/advisories/GHSA-hggm-jpg3-v476
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

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low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N 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

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N Found at https://github.com/pyca/cryptography/commit/58494b41d6ecb0f56b7c5f05d5f5e3ca0320d494
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

low

none
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N Found at https://github.com/pyca/cryptography/pull/5507
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

low

none
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N Found at https://github.com/pyca/cryptography/security/advisories/GHSA-hggm-jpg3-v476
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

low

none
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N Found at https://github.com/pypa/advisory-database/tree/main/vulns/cryptography/PYSEC-2021-62.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

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:N/AC:M/Au:N/C:P/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2020-25659
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:H/PR:N/UI:N/S:U/C:H/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2020-25659
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

low

none
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N Found at https://pypi.org/project/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

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N 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

low

none
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N 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

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.48677
EPSS Score 0.00252
Published At Aug. 1, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:10:35.466406+00:00 Pypa Importer Import https://github.com/pypa/advisory-database/blob/main/vulns/cryptography/PYSEC-2021-62.yaml 37.0.0