CVE-2012-6656 json
iconvdata/ibm930.c in GNU C Library (aka glibc) before 2.16 allows context-dependent attackers to cause a denial of service (out-of-bounds…
published 2014-12-05 11 y ago modified 2026-06-16 4 mo ago also EUVD-2012-6502
- cvss
- 5.0
- version 2.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 3.4%
- EPSS 3.4% chance of exploitation in 30 days, percentile 89%
- public exploits
- 0
- none known
Summary
iconvdata/ibm930.c in GNU C Library (aka glibc) before 2.16 allows context-dependent attackers to cause a denial of service (out-of-bounds read) via a multibyte character value of "0xffff" to the iconv function when converting IBM930 encoded data to UTF-8.
Patch / fix
- glibc Debian 14, Debian 13, Debian 12 2.17-1
debian advisories DEBIAN-CVE-2012-6656
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2012-6656 updated cvss 2.1
glibc: crash in IBM930 decoding
-
Red Hat Enterprise Linux 5 glibc Red Hat Enterprise Linux 6 nscd, glibc, glibc-utils, glibc-common Red Hat Enterprise Linux 7 nscd, glibc, glibc-utils, glibc-commonnot affected: vulnerable code not present
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
Exploit prediction
3.44% chance of exploitation in the next 30 days, higher than 89% of all scored CVEs (FIRST EPSS, 2026-11-09).
Exploits and checks
- sourceware.org https://sourceware.org/bugzilla/show_bug.cgi?id=14134 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:N/I:N/A:P |
Classification
- Weakness
-
- CWE-20 Improper Input Validation
References
-
sourceware.org
/bugzilla/show_bug.cgi?id=14134
exploit, issue-tracking
-
ubuntu.com
/usn/USN-2432-1
vendor-advisory, third-party-advisory
-
mandriva.com
/security/advisories?name=MDVSA-2014:175
vendor-advisory, broken-link
-
security.gentoo.org
/glsa/201503-04
vendor-advisory
-
debian.org
/security/2015/dsa-3142
vendor-advisory, third-party-advisory
-
securityfocus.com
/bid/69472
vdb-entry, third-party-advisory
-
openwall.com
/lists/oss-security/2014/08/29/3
mailing-list, third-party-advisory
-
openwall.com
/lists/oss-security/2014/09/02/1
mailing-list, third-party-advisory
- sourceware.org /git/?p=glibc.git%3Ba=commit%3Bh=6e230d11837f3ae7b375ea69d7905f0d18eb79e5
Sources
- CVE List CVE-2012-6656
- NVD CVE-2012-6656
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.