CVE-2020-23706: A heap-based buffer overflow vulnerability in the function ok_jpg_decode_block_subsequent_scan() ok_jpg.c:1102

Q: How do I fix CVE-2020-23706?

ok-file-formats: upgrade to newer than 2020-06-26. Exact commands for each OS are on this page.

Q: Is CVE-2020-23706 being exploited?

CVE-2020-23706 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-2020-23706 affect?

CVE-2020-23706 affects ok-file-formats. Severity is medium (CVSS 6.5). A heap-based buffer overflow vulnerability in the function ok_jpg_decode_block_subsequent_scan() ok_jpg.c:1102 of ok-file-formats through 2020-06-26 allows attackers to cause a Denial of Service (DOS) via a crafted jpeg file.

Q: How urgent is CVE-2020-23706?

Priority 44/100. Public exploit reference

This month

MEDIUM 6.5UPGRADE

CVE-2020-23706 is a medium-severity flaw (CVSS 6.5) affecting ok-file-formats. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A heap-based buffer overflow vulnerability in the function ok_jpg_decode_block_subsequent_scan() ok_jpg.c:1102 of ok-file-formats through 2020-06-26 allows attackers to cause a Denial of Service (DOS) via a crafted jpeg file.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.0% (top 37%)
CISA exploited list	No
Weakness	CWE-787
Published	2021-07-15
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: ok-file-formats project

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

Am I affected?

Timeline

2021-07-15 22:15 UTCPublished CVE record published
2026-06-17 03:04 UTCUpdated Record last modified

ok-file-formats project ok-file-formats UPGRADE

Affected: <= 2020-06-26

Fixed in: newer than 2020-06-26

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy ok-file-formats || rpm -q ok-file-formats || ok-file-formats --version

2. UPGRADE to newer than 2020-06-26 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade ok-file-formats

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ok-file-formats

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-2020-23706?

ok-file-formats: upgrade to newer than 2020-06-26. Exact commands for each OS are on this page.

Is CVE-2020-23706 being exploited?

CVE-2020-23706 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-2020-23706 affect?

CVE-2020-23706 affects ok-file-formats. Severity is medium (CVSS 6.5). A heap-based buffer overflow vulnerability in the function ok_jpg_decode_block_subsequent_scan() ok_jpg.c:1102 of ok-file-formats through 2020-06-26 allows attackers to cause a Denial of Service (DOS) via a crafted jpeg file.

How urgent is CVE-2020-23706?

Priority 44/100. Public exploit reference

Related CVEs

CVE-2021-44343 HIGH 7.8 DOWNGRADE David Brackeen ok-file-formats 203defd is vulnerable to Buffer Overflow
CVE-2021-44342 HIGH 7.8 DOWNGRADE David Brackeen ok-file-formats 203defd is vulnerable to Buffer Overflow via function ok_png_transform_scanline
CVE-2021-44340 HIGH 7.8 MITIGATE David Brackeen ok-file-formats dev version is vulnerable to Buffer Overflow
CVE-2021-44339 HIGH 7.8 DOWNGRADE David Brackeen ok-file-formats 203defd is vulnerable to Buffer Overflow
CVE-2021-44335 HIGH 7.8 DOWNGRADE David Brackeen ok-file-formats 203defd is vulnerable to Buffer Overflow

References

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