CVE-2021-43396
What it is
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.
At a glance
- Exploitability
- Can be exploited over the network without logging in. High risk of data tampering.
- Exploit odds
- 3.3% chance of exploitation in the next 30 days (EPSS).
- Fix
- A patch, advisory or fixed version is referenced. Upgrade or apply it.
Timeline
- PublishedDisclosed publicly on CVE.org and NVD
- Last updatedMost recent change to the record
Why it ranks here
- Exploited in the wild: no, CISA does not list it.
- Exploit odds: 3.3% in the next 30 days (EPSS).
- Severity: 7.5 HIGH (CVSS).
- Fix: a patch or advisory is linked.
Details
- Published
- Last modified
- Exploit probability
- 3.3% · EPSS, next 30 days
- Record status
- Modified
Affected
- Gnu Glibc 2.34
- Oracle Communications Cloud Native Core Binding Support Function 22.1.3
- Oracle Communications Cloud Native Core Network Function Cloud Native Environment 22.1.0
- Oracle Communications Cloud Native Core Network Repository Function 22.1.2
- Oracle Communications Cloud Native Core Network Repository Function 22.2.0
- Oracle Communications Cloud Native Core Security Edge Protection Proxy 22.1.1
- Oracle Communications Cloud Native Core Unified Data Repository 22.2.0
- Oracle Enterprise Operations Monitor 4.3
Attack profile CVSS 3.1 · 7.5
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- High
- Availability
- None
Raw vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Is it in your code?
Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.
Read https://cve-list.com/agent/cve/CVE-2021-43396.md and follow it. Check whether this project is affected by CVE-2021-43396. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.
Fix and advisories
- https://www.oracle.com/security-alerts/cpujul2022.html
- https://www.oracle.com/security-alerts/cpujul2022.html
References
- https://blog.tuxcare.com/vulnerability/vulnerability-in-iconv-identified-by-tuxcare-team-cve-2021-43396
- https://sourceware.org/bugzilla/show_bug.cgi?id=28524
- https://sourceware.org/git/?p=glibc.git%3Ba=commit%3Bh=ff012870b2c02a62598c04daa1e54632e020fd7d
- https://www.oracle.com/security-alerts/cpujul2022.html
- https://blog.tuxcare.com/vulnerability/vulnerability-in-iconv-identified-by-tuxcare-team-cve-2021-43396
- https://sourceware.org/bugzilla/show_bug.cgi?id=28524
- https://sourceware.org/git/?p=glibc.git%3Ba=commit%3Bh=ff012870b2c02a62598c04daa1e54632e020fd7d
- https://www.oracle.com/security-alerts/cpujul2022.html
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html