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5.3 Medium

ASN1SCC is an open source ASN.1 compiler for embedded systems.

CVE-2026-75615

ASN1SCC is an open source ASN.1 compiler for embedded systems. Prior to 4.7.0.1, the ACN runtime function AcnDecStringCharIndexprivate in asn1crt/asn1crtencodingacn.c and the generated uPER decoder InternalItemstringwithalphadecode in StgC/uperc.stg do not validate a decoded character index before reading allowedCharSet. For string alphabets whose size is not a power of two, a crafted message can select an unused encoded index, read a small bounded window of adjacent static program constants, and return the byte as a successfully decoded character. The full 128-character IA5String alphabet is not affected. This issue is fixed in version 4.7.0.1.

Assessment

CVSS
5.3 (v3.1)
Severity
Medium
Known exploited
Not listed in CISA KEV
Exploit availability
Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published
5 November 2026
Last updated
5 November 2026
Affected
esa · asn1scc
Assigner
GitHub_M

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

At the source

References

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