CVE-2021-33481: A stack-based buffer overflow vulnerability was discovered in gocr through 0.53-20200802 in try_to_divide_boxe

Q: How do I fix CVE-2021-33481?

optical character recognition: upgrade to newer than 0.53-20200802. Exact commands for each OS are on this page.

Q: Is CVE-2021-33481 being exploited?

CVE-2021-33481 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-2021-33481 affect?

CVE-2021-33481 affects optical character recognition. Severity is high (CVSS 7.8). A stack-based buffer overflow vulnerability was discovered in gocr through 0.53-20200802 in try_to_divide_boxes() in pgm2asc.c.

Q: How urgent is CVE-2021-33481?

Priority 49/100. High severity; Public exploit reference

This month

HIGH 7.8UPGRADE

CVE-2021-33481 is a high-severity flaw (CVSS 7.8) affecting optical character recognition. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A stack-based buffer overflow vulnerability was discovered in gocr through 0.53-20200802 in try_to_divide_boxes() in pgm2asc.c.

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.2% (top 31%)
CISA exploited list	No
Weakness	CWE-119, CWE-787
Published	2021-11-17
Last modified	2026-06-17

Publisher (CNA): Fedora Project · Vendor: optical character recognition project

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

Am I affected?

Timeline

2021-11-17 18:15 UTCPublished CVE record published
2026-06-17 03:54 UTCUpdated Record last modified

optical character recognition project optical character recognition UPGRADE

Affected: <= 0.53-20200802

Fixed in: newer than 0.53-20200802

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy optical-character-recognition || rpm -q optical-character-recognition || optical-character-recognition --version

2. UPGRADE to newer than 0.53-20200802 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade optical-character-recognition

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade optical-character-recognition

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-2021-33481?

optical character recognition: upgrade to newer than 0.53-20200802. Exact commands for each OS are on this page.

Is CVE-2021-33481 being exploited?

CVE-2021-33481 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-2021-33481 affect?

CVE-2021-33481 affects optical character recognition. Severity is high (CVSS 7.8). A stack-based buffer overflow vulnerability was discovered in gocr through 0.53-20200802 in try_to_divide_boxes() in pgm2asc.c.

How urgent is CVE-2021-33481?

Priority 49/100. High severity; Public exploit reference

Related CVEs

CVE-2021-33480 MEDIUM 5.5 UPGRADE An use-after-free vulnerability was discovered in gocr through 0.53-20200802 in context_correction() in pgm2as
CVE-2021-33479 HIGH 7.8 UPGRADE A stack-based buffer overflow vulnerability was discovered in gocr through 0.53-20200802 in measure_pitch() in

References

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