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CVE-2015-4515

14
FAUCET Score

CVE-2015-4515 describes an information disclosure vulnerability in Mozilla Firefox versions prior to 42.0. When NTLM v1 is enabled for HTTP authentication, a crafted website can exploit this to reveal sensitive hostname information from the Workstation field of an NTLM type 3 message. This vulnerability has a CVSS score of 4.3, indicating a medium severity with low impact, as it only allows for partial confidentiality compromise without affecting integrity or availability. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 41.0.2CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

4.3MEDIUM

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

Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Exploitability Score
8.6
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
1.84%
Probability of exploitation in next 30 days
EPSS Percentile
76.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0184 is in the 57th percentile among its peer group of 19,958 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

mozillavendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2015-4515Moderate

Mozilla: Information disclosure through NTLM authentication (MFSA 2015-117)

Nov 4, 2015

References

lists.opensuse.org / opensuse-security-announce/2015-11/msg00015.html
bugzilla.mozilla.org / show_bug.cgi
security.gentoo.org / glsa/201512-10
mozilla.org / security/announce/2015/mfsa2015-117.html
Vendor Advisory
oracle.com / technetwork/topics/security/bulletinapr2016-2952098.html
securitytracker.com / id/1034069
ubuntu.com / usn/USN-2785-1