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CVE-2015-2059

20
FAUCET Score

CVE-2015-2059 describes an out-of-bounds read vulnerability in the stringprep_utf8_to_ucs4 function of libidn before version 1.31, affecting products like Fedora and openSUSE. This flaw allows attackers to read system memory and potentially cause further impact by supplying invalid UTF-8 characters. With a CVSS score of 7.5, it is considered highly severe due to its network-based attack vector and low attack complexity, potentially leading to partial confidentiality, integrity, and availability impacts. There is no evidence of active exploitation, nor are there known public exploit codes or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.30CPE matchmatch criteria
cpe:2.3:a:gnu:libidn:*:*:*:*:*:*:*:*
13.1CPE matchmatch criteria
cpe:2.3:o:opensuse:opensuse:13.1:*:*:*:*:*:*:*
13.2CPE matchmatch criteria
cpe:2.3:o:opensuse:opensuse:13.2:*:*:*:*:*:*:*
21CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:21:*:*:*:*:*:*:*
22CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:22:*:*:*:*:*:*:*

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
3.19%
Probability of exploitation in next 30 days
EPSS Percentile
86.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0319 is in the 76th percentile among its peer group of 51,485 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, 0.1 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 (4)

github_advisorypatch availablevia nvd_reference
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: libidn
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: libidn
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: libidn

Vendor Advisories (1)

redhatCVE-2015-2059Low

libidn: out-of-bounds read with stringprep on invalid UTF-8

Feb 23, 2015

References

git.savannah.gnu.org / cgit/libidn.git/commit
Issue TrackingPatch
lists.fedoraproject.org / pipermail/package-announce/2015-July/162537.html
Third Party Advisory
lists.fedoraproject.org / pipermail/package-announce/2015-July/162549.html
Third Party Advisory
lists.opensuse.org / opensuse-updates/2015-07/msg00042.html
Third Party Advisory
lists.opensuse.org / opensuse-updates/2016-08/msg00098.html
github.com / jabberd2/jabberd2/issues/85
Issue TrackingPatchThird Party Advisory
debian.org / security/2016/dsa-3578
openwall.com / lists/oss-security/2015/02/23/25
Mailing ListThird Party Advisory
securityfocus.com / bid/72736
ubuntu.com / usn/USN-3068-1