CVE-2023-27043: The email module of Python through 3.11.3 incorrectly parses e-mail addresses that contain a special character.
Noroxi assessment
Priority: Monitor (action score 22/100)
- The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
- Probability of exploitation in the next 30 days: 2.5% (FIRST EPSS); higher than 84.8% of all records.
- Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
- According to CISA the attack is automatable: targets can be found by mass scanning.
- Fixed version: azl3 python3 3.12.0-1 on Azure Linux 3.0 3.12.0-1; azl3 python3 3.12.9-11 on Azure Linux 3.0 3.12.3-6; cbl2 python3 3.9.19-9 on CBL Mariner 2.0 3.9.19-9.
Low priority for now. Upgrade to azl3 python3 3.12.0-1 on Azure Linux 3.0 3.12.0-1; azl3 python3 3.12.9-11 on Azure Linux 3.0 3.12.3-6; cbl2 python3 3.9.19-9 on CBL Mariner 2.0 3.9.19-9 or later.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Primary sources: NVD · CVE.org · FIRST EPSS
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.
- BDU:2023-04980
- ALSA-2024:0256
- ALSA-2024:0466
- ALSA-2024:2292
- ALSA-2024:2985
- ALSA-2024:3062
- DLA-3966-1
- DLA-3980-1
- openSUSE-SU-2024:13049-1
- openSUSE-SU-2024:13066-1
- openSUSE-SU-2024:13085-1
- openSUSE-SU-2024:13099-1
- openSUSE-SU-2024:13104-1
- openSUSE-SU-2024:13135-1
- RHSA-2024:0256
- RHSA-2024:0430
- RHSA-2024:0454
- RHSA-2024:0466
- RHSA-2024:0586
- RHSA-2024:2292
- Published
- Apr 18, 2023
- Updated
- Jun 17, 2026
- EPSS
- 2.5% · 84th percentile
- CWE
- CWE-20
Report tools
Action score
22
Monitor
Low priority for now.
- CVSS
- 21 / 40 · 5.3 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 1 / 30 · 2.5%
CISA SSVC decision
- Exploitation
- proof of concept
- Automatable
- yes
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- No public exploit code on record
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
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Noroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
| Vendor | Product | CPE |
|---|---|---|
| python | python | cpe:2.3:a:python:python |
| fedoraproject | fedora | cpe:2.3:o:fedoraproject:fedora |
| netapp | active iq unified manager | cpe:2.3:a:netapp:active_iq_unified_manager |
| netapp | ontap select deploy administration utility | cpe:2.3:a:netapp:ontap_select_deploy_administration_utility |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- fedoraproject fedora38
- fedoraproject fedora39
- netapp active iq unified managerall versions
- netapp ontap select deploy administration utilityall versions
- python pythonup to 2.7.18 inclusive
- python python3.0 and later · before 3.8.20
- python python3.9.0 and later · before 3.9.20
- python python3.10.0 and later · before 3.10.15
- python python3.11.0 and later · before 3.11.10
- python python3.12.0 and later · before 3.12.6
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| AlmaLinux:8 | platform-python | before 3.6.8-56.el8_9.3.alma.1 | 3.6.8-56.el8_9.3.alma.1 |
| AlmaLinux:8 | platform-python-debug | before 3.6.8-56.el8_9.3.alma.1 | 3.6.8-56.el8_9.3.alma.1 |
| AlmaLinux:8 | platform-python-devel | before 3.6.8-56.el8_9.3.alma.1 | 3.6.8-56.el8_9.3.alma.1 |
| AlmaLinux:8 | python3-idle | before 3.6.8-56.el8_9.3.alma.1 | 3.6.8-56.el8_9.3.alma.1 |
| AlmaLinux:8 | python3-libs | before 3.6.8-56.el8_9.3.alma.1 | 3.6.8-56.el8_9.3.alma.1 |
| AlmaLinux:8 | python3-test | before 3.6.8-56.el8_9.3.alma.1 | 3.6.8-56.el8_9.3.alma.1 |
| AlmaLinux:8 | python3-tkinter | before 3.6.8-56.el8_9.3.alma.1 | 3.6.8-56.el8_9.3.alma.1 |
| AlmaLinux:8 | python3.11 | before 3.11.7-1.el8 | 3.11.7-1.el8 |
| AlmaLinux:8 | python3.11-debug | before 3.11.7-1.el8 | 3.11.7-1.el8 |
| AlmaLinux:8 | python3.11-devel | before 3.11.7-1.el8 | 3.11.7-1.el8 |
| AlmaLinux:8 | python3.11-idle | before 3.11.7-1.el8 | 3.11.7-1.el8 |
| AlmaLinux:8 | python3.11-libs | before 3.11.7-1.el8 | 3.11.7-1.el8 |
| AlmaLinux:8 | python3.11-rpm-macros | before 3.11.7-1.el8 | 3.11.7-1.el8 |
| AlmaLinux:8 | python3.11-test | before 3.11.7-1.el8 | 3.11.7-1.el8 |
| AlmaLinux:8 | python3.11-tkinter | before 3.11.7-1.el8 | 3.11.7-1.el8 |
| AlmaLinux:8 | python39 | before 3.9.18-3.module_el8.10.0+3765+2f9a457d | 3.9.18-3.module_el8.10.0+3765+2f9a457d |
| AlmaLinux:8 | python39-attrs | before 20.3.0-2.module_el8.6.0+2780+a40f65e1 | 20.3.0-2.module_el8.6.0+2780+a40f65e1 |
| AlmaLinux:8 | python39-cffi | before 1.14.3-2.module_el8.6.0+2780+a40f65e1 | 1.14.3-2.module_el8.6.0+2780+a40f65e1 |
| AlmaLinux:8 | python39-cffi | before 1.14.3-2.module_el8.6.0+3248+c431e88c | 1.14.3-2.module_el8.6.0+3248+c431e88c |
| AlmaLinux:8 | python39-chardet | before 3.0.4-19.module_el8.6.0+2780+a40f65e1 | 3.0.4-19.module_el8.6.0+2780+a40f65e1 |
| AlmaLinux:8 | python39-cryptography | before 3.3.1-3.module_el8.10.0+3765+2f9a457d | 3.3.1-3.module_el8.10.0+3765+2f9a457d |
| AlmaLinux:8 | python39-Cython | before 0.29.21-5.module_el8.6.0+2780+a40f65e1 | 0.29.21-5.module_el8.6.0+2780+a40f65e1 |
| AlmaLinux:8 | python39-Cython | before 0.29.21-5.module_el8.6.0+3248+c431e88c | 0.29.21-5.module_el8.6.0+3248+c431e88c |
| AlmaLinux:8 | python39-debug | before 3.9.18-3.module_el8.10.0+3765+2f9a457d | 3.9.18-3.module_el8.10.0+3765+2f9a457d |
+96
Same product
python: all recordsOther highest-scoring records for the same primary product.
- CVE-2016-5636Integer overflow in the get_data function in zipimport.c in CPython (aka Python) before 2.7.12, 3.x before 3.4.5, and 3.5.x before 3.5.2 all47Plan
- CVE-2007-4559Directory traversal vulnerability in the (1) extract and (2) extractall functions in the tarfile module in Python allows user-assisted remot47Plan
- CVE-2021-3177Python 3.x through 3.9.1 has a buffer overflow in PyCArg_repr in _ctypes/callproc.c, which may lead to remote code execution in certain Pyth46Plan
Published before and after this one in the same product
- ← EarlierCVE-2022-45061Nov 9, 2022 · An issue was discovered in Python before 3.11.1.31Monitor
- ← EarlierCVE-2023-24329Feb 17, 2023 · An issue in the urllib.parse component of Python before 3.11.4 allows attackers to bypass blocklisting methods by supplying a URL that start36Monitor
- Later →CVE-2023-33595Jun 7, 2023 · CPython v3.12.0 alpha 7 was discovered to contain a heap use-after-free via the function ascii_decode at /Objects/unicodeobject.c.22Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| azl3 python3 3.12.0-1 on Azure Linux 3.0 | 3.12.0-1 · CBL-Mariner Releases | Microsoft (MSRC) |
| azl3 python3 3.12.9-11 on Azure Linux 3.0 | 3.12.3-6 · CBL-Mariner Releases | Microsoft (MSRC) |
| cbl2 python3 3.9.19-9 on CBL Mariner 2.0 | 3.9.19-9 · CBL-Mariner Releases | Microsoft (MSRC) |
| almalinux:platform-python | 3.6.8-56.el8_9.3.alma.1 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:platform-python-debug | 3.6.8-56.el8_9.3.alma.1 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:platform-python-devel | 3.6.8-56.el8_9.3.alma.1 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:python-unversioned-command | 3.9.18-1.el9_3.1 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:python3 | 3.9.18-1.el9_3.1 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:python3-debug | 3.9.18-1.el9_3.1 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:python3-devel | 3.9.18-1.el9_3.1 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:python3-idle | 3.6.8-56.el8_9.3.alma.1 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:python3-libs | 3.6.8-56.el8_9.3.alma.1 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:python3-test | 3.6.8-56.el8_9.3.alma.1 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:python3-tkinter | 3.6.8-56.el8_9.3.alma.1 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:python3.11 | 3.11.7-1.el9 · AlmaLinux:9 | Package registry (OSV) |
| alpine:python3 | 3.10.15-r0 · Alpine:v3.17 | Package registry (OSV) |
| debian:pypy3 | 7.3.11+dfsg-2+deb12u3 · Debian:12 | Package registry (OSV) |
| debian:python3.11 | 3.11.2-6+deb12u5 · Debian:12 | Package registry (OSV) |
| debian:python3.9 | 3.9.2-1+deb11u2 · Debian:11 | Package registry (OSV) |
| opensuse:python | 2.7.18-150000.57.1 · openSUSE:Leap 15.4 | Package registry (OSV) |
| opensuse:python-base | 2.7.18-150000.57.1 · openSUSE:Leap 15.4 | Package registry (OSV) |
| opensuse:python-doc | 2.7.18-150000.57.1 · openSUSE:Leap 15.4 | Package registry (OSV) |
| opensuse:python3 | 3.6.15-150300.10.54.1 · openSUSE:Leap Micro 5.3 | Package registry (OSV) |
| opensuse:python3-core | 3.6.15-150300.10.54.1 · openSUSE:Leap Micro 5.3 | Package registry (OSV) |
| opensuse:python3-documentation | 3.6.15-150300.10.54.1 · openSUSE:Leap 15.5 | Package registry (OSV) |
| opensuse:python310 | 3.10.13-150400.4.39.1 · openSUSE:Leap 15.5 | Package registry (OSV) |
| opensuse:python310-core | 3.10.13-150400.4.39.1 · openSUSE:Leap 15.5 | Package registry (OSV) |
| opensuse:python310-documentation | 3.10.13-150400.4.39.1 · openSUSE:Leap 15.5 | Package registry (OSV) |
| opensuse:python311 | 3.11.8-150400.9.23.1 · openSUSE:Leap 15.5 | Package registry (OSV) |
| opensuse:python311-core | 3.11.8-150400.9.23.1 · openSUSE:Leap 15.5 | Package registry (OSV) |
+39
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
No history yet (it accumulates with the daily EPSS job).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- none
- Integrity
- low · data or configuration can be modified
- Availability
- none
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- Low
- Availability impact
- None
Weakness class (CWE)
CWE-20 · Improper Input ValidationCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
- Buffer Overflow via Environment VariablesCAPEC-10likelihood: High · High
- Server Side Include (SSI) InjectionCAPEC-101likelihood: High · High
- Cross Zone ScriptingCAPEC-104likelihood: Medium · High
- Command Line Execution through SQL InjectionCAPEC-108likelihood: Low · Very High
- Object Relational Mapping InjectionCAPEC-109likelihood: Low · High
- SQL Injection through SOAP Parameter TamperingCAPEC-110likelihood: High · Very High
- Double EncodingCAPEC-120likelihood: Low · Medium
- Subverting Environment Variable ValuesCAPEC-13likelihood: High · Very High
ATT&CK techniques
- Obfuscated Files or InformationT1027
- Masquerading: Invalid Code SignatureT1036.001
- Steal Web Session CookieT1539
- Subvert Trust Controls: Code SigningT1553.002
- Impair Defenses:Impair Command History LoggingT1562.003
- Hijack Execution Flow:Dynamic Linker HijackingT1574.006
- Hijack Execution Flow:Path Interception by PATH Environment VariableT1574.007
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (19 more)Show less
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4ZAEFSFZDNBNJPNOUTLG5COISGQDLMGV/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/75DTHSTNOFFNAWHXKMDXS7EJWC6W2FUC/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ARI7VDSNTQVXRQFM6IK5GSSLEIYV4VZH/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BQAKLUJMHFGVBRDPEY57BJGNCE5UUPHW/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HXYVPEZUA3465AEFX5JVFVP7KIFZMF3N/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/N6M5I6OQHJABNEYY555HUMMKX3Y4P25Z/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NEUNZSZ3CVSM2QWVYH3N2XGOCDWNYUA3/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ORLXS5YTKN65E2Q2NWKXMFS5FWQHRNZW/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/P2MAICLFDDO3QVNHTZ2OCERZQ34R2PIC/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/P2W2BZQIHMCKRI5FNBJERFYMS5PK6TAH/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PHVGRKQAGANCSGFI3QMYOCIMS4IFOZA5/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PU6Y2S5CBN5BWCBDAJFTGIBZLK3S2G3J/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QDRDDPDN3VFIYXJIYEABY6USX5EU66AG/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RDDC2VOX7OQC6OHMYTVD4HLFZIV6PYBC/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SINP4OVYNB2AGDYI2GS37EMW3H3F7XPZ/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SOX7BCN6YL7B3RFPEEXPIU5CMTEHJOKR/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VZXC32CJ7TWDPJO6GY2XIQRO7JZX5FLP/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XWMBD4LNHWEXRI6YVFWJMTJQUL5WOFTS/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YQVY5C5REXWJIORJIL2FIL3ALOEJEF72/
Vendor advisories and official records. Exploit/PoC links are deliberately left out.