CVE-2020-23910Public exploit

Compiler crash via recursive constraint resolution

Published Jul 18, 2023 · Updated Oct 28, 2024

Stack exhaustion in asn1c 0.9.28 and earlier allows local users to crash the compiler by processing a crafted ASN.1 module. During semantic fixing, cyclic constraint references repeatedly recurse through asn1constraint_resolve until genhash_get calls strcmp on an exhausted stack. Execution requires a user to run the command-line compiler on the crafted module; the demonstrated consequence is a segmentation fault, not code execution.

CVSS severity5.5
Medium
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack exhaustion in asn1c 0.9.28 and earlier allows local users to crash the compiler by processing a crafted ASN.1 module. During semantic fixing, cyclic constraint references repeatedly recurse through asn1constraint_resolve until genhash_get calls strcmp on an exhausted stack. Execution requires a user to run the command-line compiler on the crafted module; the demonstrated consequence is a segmentation fault, not code execution.

The record

CVE
CVE-2020-23910
Published
Jul 18, 2023
Updated
Oct 28, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 18, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 28, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.5NIST National Vulnerability DatabaseCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
5.5UbuntuCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
3.3SUSECVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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