CVE-2020-23909: Heap-based buffer over-read in function png_convert_4 in file pngex.cc in AdvanceMAME through 2.1.

Q: How do I fix CVE-2020-23909?

advancemame: upgrade to newer than 2.1. Exact commands for each OS are on this page.

Q: Is CVE-2020-23909 being exploited?

CVE-2020-23909 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-2020-23909 affect?

CVE-2020-23909 affects advancemame. Severity is high (CVSS 7.1). Heap-based buffer over-read in function png_convert_4 in file pngex.cc in AdvanceMAME through 2.1.

Q: How urgent is CVE-2020-23909?

Priority 36/100. High severity; Public exploit reference

Routine

HIGH 7.1UPGRADE

CVE-2020-23909 is a high-severity flaw (CVSS 7.1) affecting advancemame. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Heap-based buffer over-read in function png_convert_4 in file pngex.cc in AdvanceMAME through 2.1.

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	7.1 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 77%)
CISA exploited list	No
Weakness	CWE-125
Published	2023-07-18
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: advancemame

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

advancemame advancemame UPGRADE

Affected: <= 2.1

Fixed in: newer than 2.1

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 2.1 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade advancemame

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-2020-23909?

advancemame: upgrade to newer than 2.1. Exact commands for each OS are on this page.

Is CVE-2020-23909 being exploited?

CVE-2020-23909 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-2020-23909 affect?

CVE-2020-23909 affects advancemame. Severity is high (CVSS 7.1). Heap-based buffer over-read in function png_convert_4 in file pngex.cc in AdvanceMAME through 2.1.

How urgent is CVE-2020-23909?

Priority 36/100. High severity; Public exploit reference

References

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