Vulnerability Report

CVE-2020-15904

Title: Buffer Overflow in bsdiff4 patching routine

Memory Corruption

Proof Of Concept

No public PoC currently indexed for CVE-2020-15904.

CWE Category CWE-787

Published Date Jul 22, 2020

Modified Date Jun 17, 2026

Exploit Status Not Found

Score 7.8 CVSS v3.1

Exploit Probability (EPSS)

1.05%

Vulnerability Summary

CVE-2020-15904: A buffer overflow in the patching routine of bsdiff4 before 1.2.0 allows an attacker to write to heap memory (beyond allocated bounds) via a crafted patch file.

Impacted Vendors

pypi 1

Reference Links

https://github.com/ilanschnell/bsdiff4/blob/master/CHANGELOG.txt https://github.com/ilanschnell/bsdiff4/commit/49a4cee2feef7deaf9d89e5e793a8824930284d7 https://github.com/ilanschnell/bsdiff4/blob/master/CHANGELOG.txt https://github.com/ilanschnell/bsdiff4/commit/49a4cee2feef7deaf9d89e5e793a8824930284d7

CVSS v3.1

Source Entity [email protected]

Severity HIGH

7.8

Attack Vector

LOCAL

Complexity

LOW

Privileges

N/A

Interaction

REQUIRED

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

RAW VECTOR CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS v2.0

Source Entity [email protected]

Severity MEDIUM

6.8

Access Vector

N/A

Authentication

N/A

RAW VECTOR AV:N/AC:M/Au:N/C:P/I:P/A:P

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2020-15904 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

June 17, 2026 MODIFIED

Vulnerability data updated via NVD.

November 21, 2024 MODIFIED

Vulnerability data or affected products updated.

July 22, 2020 PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector LOCAL

Complexity LOW

Privileges N/A

Interaction REQUIRED

CVSS Vector String


                                    CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected Stack

No specific products linked.