CVE-2015-20107Public exploitNetwork attack vector

Shell command execution via unescaped mailcap input

Published Apr 13, 2022 · Updated Nov 3, 2025

Command injection in CPython 3.10.7 and earlier allows attackers to execute shell commands via untrusted mailcap filenames or arguments. The mailcap.findmatch function substitutes filenames, MIME types, and parameters into a configured command line without rejecting shell metacharacters. Exploitation requires an application to pass attacker-controlled input to findmatch and execute the returned command, which runs with that application's privileges.

CVSS severity7.6
High
EPSS probability7.07%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in CPython 3.10.7 and earlier allows attackers to execute shell commands via untrusted mailcap filenames or arguments. The mailcap.findmatch function substitutes filenames, MIME types, and parameters into a configured command line without rejecting shell metacharacters. Exploitation requires an application to pass attacker-controlled input to findmatch and execute the returned command, which runs with that application's privileges.

The record

CVE
CVE-2015-20107
Published
Apr 13, 2022
Updated
Nov 3, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-77, T1059.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 13, 2022CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.0NIST NVDAV:N/AC:L/Au:S/C:P/I:C/A:P
7.6NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L
7.1SUSECVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
7.6UbuntuCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1059.004Unix Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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