7.5

CVE-2023-49083: cryptography vulnerable to NULL-dereference when loading PKCS7 certificates

Modified
AliasesSUSE-SU-2023:4842-1SUSE-SU-2023:4843-1SUSE-SU-2023:4844-1
Published 29-11-2023Last modified 18-12-2025

Vulnerability summary

CVE-2023-49083 is a high (CVSS 7.5) NULL Pointer Dereference vulnerability in cryptography.io cryptography. EPSS estimates a 0.98% chance of exploitation in the next 30 days, higher than 62.3% of scored vulnerabilities. 1 public exploit is recorded.

Priority
Routine

Not severe (CVSS 5.9, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
0.98%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits1github

Advisory lineage

Upstream 0 · Downstream 7 · Related 4
DLA-3922-1MGASA-2025-0069OPENSUSE-SU-2026:11468-1RHSA-2024:1640RHSA-2024:1878RHSA-2024:3781

Timeline

  1. 29-11-2023
    PublishedVulnerability first disclosed.
  2. 18-12-2025
    Last modifiedVulnerability information updated.

Description

cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. Calling `load_pem_pkcs7_certificates` or `load_der_pkcs7_certificates` could lead to a NULL-pointer dereference and segfault. Exploitation of this vulnerability poses a serious risk of Denial of Service (DoS) for any application attempting to deserialize a PKCS7 blob/certificate. The consequences extend to potential disruptions in system availability and stability. This vulnerability has been patched in version 41.0.6.

CVSS metrics

8 scores · 8 sources · 1 version

EPSS trend

Probability

0.98%

Chance of exploitation in the next 30 days

Percentile

62%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.98% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

1 found
  • githubUnverified

    Cryptography

    Maturity: poc

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Suse10 products
  • python-cryptography&distro=SUSE Linux Enterprise Micro 5.1< 3.3.2-150200.22.1
  • python-cryptography&distro=SUSE Linux Enterprise Micro 5.2< 3.3.2-150200.22.1
  • python-cryptography&distro=SUSE Linux Enterprise Module for Public Cloud 15 SP1< 3.3.2-150100.7.18.1
  • python-cryptography&distro=SUSE Linux Enterprise Module for Python 3 15 SP4< 41.0.3-150400.16.12.1
  • python-cryptography&distro=SUSE Linux Enterprise Module for Python 3 15 SP5< 41.0.3-150400.16.12.1
Opensuse7 products
  • python-cryptography&distro=openSUSE Leap 15.4< 41.0.3-150400.16.12.1
  • python-cryptography&distro=openSUSE Leap 15.5< 41.0.3-150400.16.12.1
  • python-cryptography&distro=openSUSE Tumbleweed< 41.0.7-1.1
  • python3-cryptography&distro=openSUSE Leap 15.4< 3.3.2-150400.23.1
  • python3-cryptography&distro=openSUSE Leap 15.5< 3.3.2-150400.23.1
Redhat7 products
  • python-cryptography< 0:3.2.1-4.el8_4.1 | < 0:3.2.1-6.el8_8 | < 0:36.0.1-2.el9_2.1 | < 0:36.0.1-1.el9_0.1 | < 0:36.0.1-4.el9_4.1 | < 0:3.2.1-5.1.el8_6.1 | < 0:3.2.1-8.el8_10 | < 0:36.0.1-5.el9_6
  • python-cryptography-debugsource< 0:3.2.1-4.el8_4.1 | < 0:3.2.1-6.el8_8 | < 0:36.0.1-2.el9_2.1 | < 0:36.0.1-1.el9_0.1 | < 0:36.0.1-4.el9_4.1 | < 0:3.2.1-5.1.el8_6.1 | < 0:3.2.1-8.el8_10 | < 0:36.0.1-5.el9_6
  • python3-cryptography< 0:3.2.1-4.el8_4.1 | < 0:3.2.1-6.el8_8 | < 0:36.0.1-2.el9_2.1 | < 0:36.0.1-1.el9_0.1 | < 0:36.0.1-4.el9_4.1 | < 0:3.2.1-5.1.el8_6.1 | < 0:3.2.1-8.el8_10 | < 0:36.0.1-5.el9_6
  • python3-cryptography-debuginfo< 0:3.2.1-4.el8_4.1 | < 0:3.2.1-6.el8_8 | < 0:36.0.1-2.el9_2.1 | < 0:36.0.1-1.el9_0.1 | < 0:36.0.1-4.el9_4.1 | < 0:3.2.1-5.1.el8_6.1 | < 0:3.2.1-8.el8_10 | < 0:36.0.1-5.el9_6
  • python3.11-cryptography< 0:37.0.2-5.el8_8.1 | < 0:37.0.2-6.el9 | < 0:37.0.2-6.el8
Chainguard3 products
  • mitmproxy< 12.2.1-r0
  • py3-cassandra-medusa< 0.19.1-r1
  • py3-cassandra-medusa-compat< 0.19.1-r1
Wolfi3 products
  • mitmproxy< 12.2.1-r0
  • py3-cassandra-medusa< 0.19.1-r1
  • py3-cassandra-medusa-compat< 0.19.1-r1
Cryptography.io1 product
Debian1 product
  • python-cryptography< 38.0.4-3+deb12u1 | < 41.0.7-1
Pyca1 product
PyPI1 product
  • cryptography< f09c261ca10a31fe41b1262306db7f8f1da0e48a | ≥ 3.1, < 41.0.6
Ubuntu1 product
  • python-cryptography< 3.4.8-1ubuntu2.1

10 vendors · 35 products

References

49 links
Show all 49 references