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Fencer Intel
high 7.8

CVE-2015-20107 json

In Python (aka CPython) up to 3.10.8, the mailcap module does not add escape characters into commands discovered in the system mailcap file.

published 2022-04-13 4 y ago modified 2026-10-14 26 d ago also EUVD-2015-2111

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
2.8%
EPSS 2.8% chance of exploitation in 30 days, percentile 86%
public exploits
0
none known

Summary

In Python (aka CPython) up to 3.10.8, the mailcap module does not add escape characters into commands discovered in the system mailcap file. This may allow attackers to inject shell commands into applications that call mailcap.findmatch with untrusted input (if they lack validation of user-provided filenames or arguments). The fix is also back-ported to 3.7, 3.8, 3.9

Patch / fix

  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP V3.1.5
  • Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP V3.1.5
  • Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP V3.1.5
  • pypy3 Debian 14, Debian 13, Debian 12 7.3.11+dfsg-1

debian advisories DEBIAN-CVE-2015-20107

  • python2.7 Ubuntu 18.04 LTS 2.7.17-1~18.04ubuntu1.8
  • python2.7 Ubuntu 20.04 LTS 2.7.18-1~20.04.3
  • python2.7 Ubuntu 22.04 LTS 2.7.18-13ubuntu1.1
  • python3.6 Ubuntu 18.04 LTS 3.6.9-1~18.04ubuntu1.8
  • python3.8 Ubuntu 20.04 LTS 3.8.10-0ubuntu1~20.04.5
  • python3.10 Ubuntu 22.04 LTS 3.10.4-3ubuntu0.1
  • python2.7 Ubuntu Pro 14.04 LTS 2.7.6-8ubuntu0.6+esm11
  • python2.7 Ubuntu Pro 16.04 LTS 2.7.12-1ubuntu0~16.04.18+esm2

ubuntu advisories UBUNTU-CVE-2015-20107

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • rh-python38-python RHEL 3 SOFTWARE_COLLECTIONS 3.8.14-1.el7
  • rh-python38-python-idle RHEL 3 SOFTWARE_COLLECTIONS 3.8.14-1.el7
  • rh-python38-python-libs RHEL 3 SOFTWARE_COLLECTIONS 3.8.14-1.el7
  • rh-python38-python-test RHEL 3 SOFTWARE_COLLECTIONS 3.8.14-1.el7
  • rh-python38-python-tkinter RHEL 3 SOFTWARE_COLLECTIONS 3.8.14-1.el7
  • rh-python38-python-rpm-macros RHEL 3 SOFTWARE_COLLECTIONS 3.8.14-1.el7
  • rh-python38-python-srpm-macros RHEL 3 SOFTWARE_COLLECTIONS 3.8.14-1.el7
  • python3.9 RHEL 9 3.9.14-1.el9

red hat advisories RHSA-2022:6766RHSA-2022:8353RHSA-2022:6457RHSA-2022:7581RHSA-2022:7592RHSA-2022:7593

  • python310 SLE Module for Python 3 15 SP4, openSUSE Leap 15.4 3.10.10-150400.4.22.1
  • python310-core SLE Module for Python 3 15 SP4, openSUSE Leap 15.4 3.10.10-150400.4.22.1
  • python310-documentation openSUSE Leap 15.4 3.10.10-150400.4.22.1
  • python39 SLES for SAP 15 SP3, SLES 15 SP3-LTSS, SLE Real Time 15 SP3 +6 more 3.9.16-150300.4.24.1
  • python39-core SLES for SAP 15 SP3, SLES 15 SP3-LTSS, SLE Real Time 15 SP3 +6 more 3.9.16-150300.4.24.1
  • python39-documentation openSUSE Leap 15.4 3.9.16-150300.4.24.1
  • python3 SLE Module for Basesystem 15 SP4, SLE Module for Basesystem 15 SP3, SLE Micro 5.2 +3 more 3.6.15-150300.10.27.1
  • python3-core SLE Module for Development Tools 15 SP4, SLE Module for Development Tools 15 SP3, SLE Module for Basesystem 15 SP4 +5 more 3.6.15-150300.10.27.1

suse advisories SUSE-SU-2023:0748-1SUSE-SU-2023:0707-1SUSE-SU-2022:2357-2SUSE-SU-2022:2357-1SUSE-SU-2022:2351-1SUSE-SU-2022:2344-1

  • python openSUSE Tumbleweed 2.7.18-22.1
  • python39 openSUSE Tumbleweed 3.9.13-2.1
  • python310 openSUSE Tumbleweed 3.10.5-2.1

opensuse advisories openSUSE-SU-2024:12143-1openSUSE-SU-2024:12150-1openSUSE-SU-2024:12152-1

  • python3 AlmaLinux 9 3.9.14-1.el9
  • python3-idle AlmaLinux 9 3.9.14-1.el9
  • python3-libs AlmaLinux 9 3.9.14-1.el9
  • python3-test AlmaLinux 9 3.9.14-1.el9
  • python3-tkinter AlmaLinux 9 3.9.14-1.el9
  • python-unversioned-command AlmaLinux 9 3.9.14-1.el9
  • python38 AlmaLinux 8 3.8.13-1.module_el8.7.0+3344+99a6a656
  • python38-py AlmaLinux 8 1.8.0-8.module_el8.6.0+2778+cd494b30

almalinux advisories ALSA-2022:8353ALSA-2022:7581ALSA-2022:7592ALSA-2022:7593ALSA-2022:6457

  • python3.9 Rocky Linux 9 3.9.14-1.el9_1.1
  • pytz Rocky Linux 8 2017.2-12.module+el8.5.0+706+735ec4b3
  • pytz Rocky Linux 8 2017.2-12.module+el8.4.0+403+9ae17a31
  • babel Rocky Linux 8 2.5.1-10.module+el8.5.0+706+735ec4b3
  • numpy Rocky Linux 8 1:1.14.2-16.module+el8.5.0+706+735ec4b3
  • numpy Rocky Linux 8 1:1.14.2-16.module+el8.4.0+403+9ae17a31
  • scipy Rocky Linux 8 1.0.0-21.module+el8.5.0+671+195e4563
  • Cython Rocky Linux 8 0.28.1-7.module+el8.5.0+706+735ec4b3

rocky linux advisories RLSA-2022:8353RLSA-2022:7593RLSA-2022:7592RLSA-2022:7581

  • python3 Alpine 3.24, Alpine 3.23, Alpine 3.22 +5 more 3.10.5-r0

alpine advisories ALPINE-CVE-2015-20107

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • python3 CBL-Mariner 2.0 3.9.13-5

azure linux advisories AZL-9417

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2015-20107 updated cvss 7.6

python: mailcap: findmatch() function does not sanitize the second argument

  • Red Hat Enterprise Linux 7 python3, python3-idle, python3-libs, python3-test, python3-tkinter
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Software Collections python27, python27-runtime, python27-scldevel
    affected: workaround, no fix planned “Will not fix”
  • Red Hat CodeReady Linux Builder (v. 8) pytest 4.6.6-3.module+el8.4.0+8888+89bc7e79, pytest 6.0.2-2.module+el8.4.0+9822+20bf1249, Cython 0.29.21-5.module+el8.4.0+9822+20bf1249, pybind11 2.7.1-1.module+el8.6.0+12838+640e6226, python-py 1.8.0-8.module+el8.4.0+8888+89bc7e79, python-py 1.10.0-1.module+el8.4.0+9822+20bf1249, +34 more
    fixed: vendor fix RHSA-2022:7581
  • Red Hat CodeReady Linux Builder (v. 9) python3 3.9.14-1.el9, python3-idle 3.9.14-1.el9, python3-test 3.9.14-1.el9, python3-tkinter 3.9.14-1.el9
    fixed: vendor fix RHSA-2022:8353
  • Red Hat Enterprise Linux AppStream (v. 8) python3-idle 3.6.8-47.el8_6, python3-test 3.6.8-47.el8_6, platform-python 3.6.8-47.el8_6, python3-tkinter 3.6.8-47.el8_6, pytz 2019.3-3.module+el8.4.0+8888+89bc7e79, scipy 1.3.1-4.module+el8.4.0+8888+89bc7e79, +207 more
    fixed: vendor fix RHSA-2022:6457
  • Red Hat Enterprise Linux AppStream (v. 9) python3-tkinter 3.9.14-1.el9, python-unversioned-command 3.9.14-1.el9
    fixed: vendor fix RHSA-2022:8353
  • Red Hat Enterprise Linux BaseOS (v. 8) python3 3.6.8-47.el8_6, python3-libs 3.6.8-47.el8_6, python3-test 3.6.8-47.el8_6, platform-python 3.6.8-47.el8_6
    fixed: vendor fix RHSA-2022:6457
  • Red Hat Enterprise Linux BaseOS (v. 9) python3 3.9.14-1.el9, python3.9 3.9.14-1.el9, python3-libs 3.9.14-1.el9
    fixed: vendor fix RHSA-2022:8353
show 2 more
  • Red Hat Software Collections for RHEL Workstation(v. 7) rh-python38-python 3.8.14-1.el7, rh-python38-python-idle 3.8.14-1.el7, rh-python38-python-libs 3.8.14-1.el7, rh-python38-python-test 3.8.14-1.el7, rh-python38-python-tkinter 3.8.14-1.el7, rh-python38-python-rpm-macros 3.8.14-1.el7, +1 more Red Hat Software Collections for RHEL(v. 7) rh-python38-python 3.8.14-1.el7, rh-python38-python-idle 3.8.14-1.el7, rh-python38-python-libs 3.8.14-1.el7, rh-python38-python-test 3.8.14-1.el7, rh-python38-python-tkinter 3.8.14-1.el7, rh-python38-python-rpm-macros 3.8.14-1.el7, +1 more
    fixed: vendor fix RHSA-2022:6766
  • Red Hat Enterprise Linux 6 python, tkinter, python-libs, python-test, python-tools Red Hat Enterprise Linux 7 python, tkinter, python-libs, python-test, python-tools Red Hat Enterprise Linux 8 scipy, python2, python36, python-nose, python-wheel, python2-libs, +24 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-23-348-10 updated cvss 7.6

Siemens SIMATIC S7-1500

  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) >= 3.1.0, < 3.1.5 Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= 3.1.0, < 3.1.5 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= 3.1.0, < 3.1.5 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) >= 3.1.0, < 3.1.5 Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) >= 3.1.0, < 3.1.5
    affected: fixed in V3.1.5, mitigation support.industry.siemens.com

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
32 d ago

Exploit prediction

2.78% chance of exploitation in the next 30 days, higher than 86% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • bugs.python.org https://bugs.python.org/issue24778 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 7.6 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 8.0 AV:N/AC:L/Au:S/C:P/I:C/A:P

Affected products

  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP
  • Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP
  • Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP

Classification

Weakness
  • CWE-77 Improper Neutralization of Special Elements used in a Command

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.