Mozilla Firefox < 43.0.2 RSA-MD5 Collision-based Forgery Weakness (SLOTH)

Medium Nessus Network Monitor Plugin ID 9076


The remote host has a web browser installed that may accept MD5 signatures within TLS 1.2.


The version of Firefox is prior to 43.0.2 and is affected by a collision-based forgery vulnerability, known as SLOTH (Security Losses from Obsolete and Truncated Transcript Hashes), in the TLS protocol due to accepting RSA-MD5 signatures in the server signature within the TLS 1.2 ServerKeyExchange messages during a TLS handshake. A man-in-the-middle attacker can exploit this, via a transcript collision attack, to impersonate a TLS server. (CVE-2015-7575)


Upgrade to Firefox 43.0.2 or later.

See Also

Plugin Details

Severity: Medium

ID: 9076

Family: Web Clients

Published: 2016/02/19

Updated: 2019/03/06

Dependencies: 9131

Nessus ID: 88591

Risk Information

Risk Factor: Medium

CVSS v2.0

Base Score: 5

Temporal Score: 3.7

Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:P/A:N

Temporal Vector: CVSS2#E:U/RL:OF/RC:C

CVSS v3.0

Base Score: 3.7

Temporal Score: 3.2

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

Temporal Vector: CVSS:3.0/E:F/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:mozilla:firefox

Patch Publication Date: 2015/12/22

Vulnerability Publication Date: 2015/12/24

Reference Information

CVE: CVE-2015-7575

BID: 79684