HIGH
CVE-2021-3326
CWE-617Published: January 27, 2021· Updated: Jun 17, 2026
7.5
CVSS v3.1
Official Description
The iconv function in the GNU C Library (aka glibc or libc6) 2.32 and earlier, when processing invalid input sequences in the ISO-2022-JP-3 encoding, fails an assertion in the code path and aborts the program, potentially resulting in a denial of service.
Technical Analysis
CVE-2021-3326 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Vendors & Products
Debian1 product(s)
debian linux
fujitsu12 product(s)
m10-1 firmwarem10-1m10-4 firmwarem10-4m10-4s firmwarem10-4sm12-1 firmwarem12-1m12-2 firmwarem12-2m12-2s firmwarem12-2s
gnu1 product(s)
glibc
netapp2 product(s)
e-series santricity os controllerontap select deploy administration utility
Oracle1 product(s)
communications cloud native core security edge protection proxy
Source: NVD CPE · 17 total CPE entries
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.
Official Patches & Advisories
All References (16)
→
http://www.openwall.com/lists/oss-security/2021/01/28/2Mailing List · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2022/10/msg00021.htmlMailing List · Third Party Advisory
→
https://security.gentoo.org/glsa/202107-07Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20210304-0007/Third Party Advisory
→
https://sourceware.org/bugzilla/show_bug.cgi?id=27256Issue Tracking · Third Party Advisory
→
https://www.oracle.com/security-alerts/cpuapr2022.htmlNot Applicable
→
https://www.oracle.com/security-alerts/cpujan2022.htmlPatch · Third Party Advisory
→
http://www.openwall.com/lists/oss-security/2021/01/28/2Mailing List · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2022/10/msg00021.htmlMailing List · Third Party Advisory
→
https://security.gentoo.org/glsa/202107-07Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20210304-0007/Third Party Advisory
→
https://sourceware.org/bugzilla/show_bug.cgi?id=27256Issue Tracking · Third Party Advisory
→
https://www.oracle.com/security-alerts/cpuapr2022.htmlNot Applicable
Quick Facts
CVE IDCVE-2021-3326
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-617
CISA KEVNo
Affected5 vendor(s)
PublishedJan 27, 2021
Related CVEs (CWE-617)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2021-3326 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.