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CVE-2015-4522

24
FAUCET Score

CVE-2015-4522 describes a memory corruption vulnerability in the nsUnicodeToUTF8::GetMaxLength function of Mozilla Firefox versions prior to 41.0 and Firefox ESR 38.x prior to 38.3. This flaw could lead to a denial of service (application crash) or potentially other unspecified impacts. With a CVSS score of 7.5, this vulnerability is considered high severity, requiring no authentication and low attack complexity, potentially leading to partial confidentiality, integrity, and availability impacts. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
38.0CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:38.0:*:*:*:*:*:*:*
38.0.1CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:38.0.1:*:*:*:*:*:*:*
38.0.5CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:38.0.5:*:*:*:*:*:*:*
38.1.0CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:38.1.0:*:*:*:*:*:*:*
38.1.1CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:38.1.1:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

7.5HIGH

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

Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
6.4
CvssVersion
2.0

Exploit Intelligence

EPSS Score
3.50%
Probability of exploitation in next 30 days
EPSS Percentile
87.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0350 is in the 79th percentile among its peer group of 51,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (7)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: firefox-0:38.3.0-2.el6_7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: firefox-0:38.3.0-2.el5_11
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: thunderbird-0:38.3.0-1.el5_11
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: thunderbird-0:38.3.0-1.el7_1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: thunderbird-0:38.3.0-1.el6_7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: firefox-0:38.3.0-2.ael7b_1
View patch
mozillavendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2015-4522Important

Mozilla: Vulnerabilities found through code inspection (MFSA 2015-112)

Sep 22, 2015

References

lists.opensuse.org / opensuse-security-announce/2015-10/msg00000.html
lists.opensuse.org / opensuse-security-announce/2015-10/msg00003.html
lists.opensuse.org / opensuse-security-announce/2015-10/msg00004.html
lists.opensuse.org / opensuse-security-announce/2015-10/msg00005.html
lists.opensuse.org / opensuse-security-announce/2015-10/msg00007.html
lists.opensuse.org / opensuse-security-announce/2015-11/msg00025.html
rhn.redhat.com / errata/RHSA-2015-1834.html
rhn.redhat.com / errata/RHSA-2015-1852.html
bugzilla.mozilla.org / show_bug.cgi
debian.org / security/2015/dsa-3365
mozilla.org / security/announce/2015/mfsa2015-112.html
Vendor Advisory
oracle.com / technetwork/topics/security/bulletinapr2016-2952098.html
oracle.com / technetwork/topics/security/linuxbulletinoct2015-2719645.html
securityfocus.com / bid/76816
securitytracker.com / id/1033640
ubuntu.com / usn/USN-2743-1
ubuntu.com / usn/USN-2743-2
ubuntu.com / usn/USN-2743-3
ubuntu.com / usn/USN-2743-4
ubuntu.com / usn/USN-2754-1