Vulnerability in GNU Glibc
CVE-2021-43396
In iconvdata/iso-2022-jp-3.c in the GNU C Library (aka glibc) 2.34, remote attackers can force iconv() to emit a spurious '\0' character via crafted ISO-2022-JP-3 data that is accompanied by an internal state reset. This may affect data integrity in certain iconv() use cases. NOTE: the vendor states "the bug cannot be invoked through user input and requires iconv to be invoked with a NULL inbuf, which ought to require a separate application bug to do so unintentionally. Hence there's no security impact to the bug.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.033 (88.0th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 88th percentile — 88.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.033 · newest: 0.033 · change: 0.000
Affected products
- GNU Glibc — versions 2.34
- Oracle Communications Cloud Native Core Binding Support Function — versions 22.1.3
- Oracle Communications Cloud Native Core Network Function Environment — versions 22.1.0
- Oracle Communications Cloud Native Core Network Repository Function — versions 22.1.2, 22.2.0
- Oracle Communications Cloud Native Core Security Edge Protection Proxy — versions 22.1.1
- Oracle Communications Cloud Native Core Unified Data Repository — versions 22.2.0
- Oracle Enterprise Operations Monitor — versions 4.3, 4.4, 5.0
Public proof-of-concept exploits
References
- sourceware.org/bugzilla/show_bug.cgi (Exploit, Third Party Advisory, Issue Tracking)
- sourceware.org/git/
- blog.tuxcare.com/vulnerability/vulnerability-in-iconv-identified-by-tuxcare-tea… (Exploit, Third Party Advisory)
- www.oracle.com/security-alerts/cpujul2022.html (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-43396?
- CVE-2021-43396 is a high-severity vulnerability in GNU Glibc. CVSS score: 7.5/10. Published 2021-11-04.
- How severe is CVE-2021-43396?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2021-43396 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.