CVE-2020-23910: Stack-based buffer overflow vulnerability in asn1c through v0.9.28 via function genhash_get in genhash.c.

Q: How do I fix CVE-2020-23910?

asn1c: upgrade to newer than 0.9.28. Exact commands for each OS are on this page.

Q: Is CVE-2020-23910 being exploited?

CVE-2020-23910 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2020-23910 affect?

CVE-2020-23910 affects asn1c. Severity is medium (CVSS 5.5). Stack-based buffer overflow vulnerability in asn1c through v0.9.28 via function genhash_get in genhash.c.

Q: How urgent is CVE-2020-23910?

Priority 30/100. Public exploit reference

Routine

MEDIUM 5.5UPGRADE

CVE-2020-23910 is a medium-severity flaw (CVSS 5.5) affecting asn1c. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Stack-based buffer overflow vulnerability in asn1c through v0.9.28 via function genhash_get in genhash.c.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 78%)
CISA exploited list	No
Weakness	CWE-787
Published	2023-07-18
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: asn1c project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-07-18 14:15 UTCPublished CVE record published
2026-06-17 03:05 UTCUpdated Record last modified

asn1c project asn1c UPGRADE

Affected: <= 0.9.28

Fixed in: newer than 0.9.28

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy asn1c || rpm -q asn1c || asn1c --version

2. UPGRADE to newer than 0.9.28 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade asn1c

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade asn1c

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-23910?

asn1c: upgrade to newer than 0.9.28. Exact commands for each OS are on this page.

Is CVE-2020-23910 being exploited?

CVE-2020-23910 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-23910 affect?

CVE-2020-23910 affects asn1c. Severity is medium (CVSS 5.5). Stack-based buffer overflow vulnerability in asn1c through v0.9.28 via function genhash_get in genhash.c.

How urgent is CVE-2020-23910?

Priority 30/100. Public exploit reference

Related CVEs

CVE-2020-23911 MEDIUM 5.5 UPGRADE An issue was discovered in asn1c through v0.9.28

References

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