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Home / CVE DB / CVE-2023-27043
Standard
Vulnerability Identifier

CVE-2023-27043

2023-04-19
Severity Assessment
5.3
MEDIUM
CVSS v3.x Score
Clinical Analysis (Description)

The email module of Python through 3.11.3 incorrectly parses e-mail addresses that contain a special character. The wrong portion of an RFC2822 header is identified as the value of the addr-spec. In some applications, an attacker can bypass a protection mechanism in which application access is granted only after verifying receipt of e-mail to a specific domain (e.g., only @company.example.com addresses may be used for signup). This occurs in email/_parseaddr.py in recent versions of Python.

Vector Sequencing

Attack Parameters

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Impact Consequences

Technical Impact

Unchanged
Scope
None
Confidentiality
Low
Integrity
None
Availability
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Weakness Classification

CWE-CWE-20

View CWE Details ↗
Affected Population

Affected Configurations

Total: 4 detected entries

Software List Scrollable
ne
active_iq_unified_manager
Vendor: netapp • v-
fe
fedora
Vendor: fedoraproject • v39
fe
fedora
Vendor: fedoraproject • v38
ne
ontap_select_deploy_administration_utility
Vendor: netapp • v-
Timeline

Time Line

PUBLICATION
19 Apr 2023
MODIFICATION
17 Dec 2025
FIRST PATCH
24 Oct 2025
Impact Statistics

Key Metrics

CVSS Score
5.3
MEDIUM
Products
4
Affected
Patches
3
Available
Remediation Protocol

Recommended Solution

No automatic solution found. Check vendor references.
Patch Library
CVE-2023-27043: None
DL
CVE-2023-27043: The email module of Python through 3.11.3 incorrectly parses e-mail addresses that contain a special character. The wrong portion of an RFC2822 header is identified as the value of the addr-spec. In some applications, an attacker can bypass a protection mechanism in which application access is granted only after verifying receipt of e-mail to a specific domain (e.g., only @company.example.com addresses may be used for signup). This occurs in email/_parseaddr.py in recent versions of Python.
DL
Oracle Critical Patch Update Advisory - January 2025
DL
Recommended Actions for Administrators

Immediate Action Plan

1. Inventory

Identify all affected systems in your infrastructure.

2. Assessment

Assess exposure and criticality for your organization.

3. Mitigation

Apply patches or available workarounds.

4. Verification

Test and confirm effectiveness of applied measures.

Sources & Bibliography
NIST NVD MITRE CVE External Reference ↗ External Reference ↗ External Reference ↗ External Reference ↗ External Reference ↗