CVE-2023-33551: Heap Buffer Overflow in the erofsfsck_dirent_iter function in fsck/main.c in erofs-utils v1.6 allows remote at

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HIGH 7.8DOWNGRADE

CVE-2023-33551 is a high-severity flaw (CVSS 7.8) affecting erofs-utils. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Heap Buffer Overflow in the erofsfsck_dirent_iter function in fsck/main.c in erofs-utils v1.6 allows remote attackers to execute arbitrary code via a crafted erofs filesystem image.

Why this priority

High severity
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.8% (top 43%)
CISA exploited list	No
Weakness	CWE-787
Published	2023-06-01
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: erofs-utils project

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

Am I affected?

Timeline

2023-06-01 15:15 UTCPublished CVE record published
2026-06-17 06:01 UTCUpdated Record last modified

erofs-utils project erofs-utils DOWNGRADE

Affected: 1.6

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.6

1. Check installed version

apt-cache policy erofs-utils || rpm -q erofs-utils || erofs-utils --version

2. No fixed release: DOWNGRADE to a release before 1.6 (Debian / Ubuntu)

apt-cache madison erofs-utils sudo apt install erofs-utils=<VERSION_BEFORE_1.6> sudo apt-mark hold erofs-utils

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list erofs-utils sudo dnf downgrade erofs-utils-<VERSION_BEFORE_1.6> sudo dnf versionlock add erofs-utils

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2023-33551?

erofs-utils: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-33551 being exploited?

CVE-2023-33551 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-2023-33551 affect?

CVE-2023-33551 affects erofs-utils. Severity is high (CVSS 7.8). Heap Buffer Overflow in the erofsfsck_dirent_iter function in fsck/main.c in erofs-utils v1.6 allows remote attackers to execute arbitrary code via a crafted erofs filesystem image.

How urgent is CVE-2023-33551?

Priority 47/100. High severity; Public exploit reference

Related CVEs

CVE-2023-33552 HIGH 7.8 DOWNGRADE Heap Buffer Overflow in the erofs_read_one_data function at data.c in erofs-utils v1.6 allows remote attackers

References

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