CVE-2021-33930: Buffer overflow vulnerability in function pool_installable_whatprovides in src/repo.h in libsolv before 0.7.17

Q: How do I fix CVE-2021-33930?

libsolv: upgrade to newer than 0.7.17. Exact commands for each OS are on this page.

Q: Is CVE-2021-33930 being exploited?

CVE-2021-33930 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-2021-33930 affect?

CVE-2021-33930 affects libsolv. Severity is high (CVSS 7.5). Buffer overflow vulnerability in function pool_installable_whatprovides in src/repo.h in libsolv before 0.7.17 allows attackers to cause a Denial of Service.

Q: How urgent is CVE-2021-33930?

Priority 55/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADE

CVE-2021-33930 is a high-severity flaw (CVSS 7.5) affecting libsolv. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Buffer overflow vulnerability in function pool_installable_whatprovides in src/repo.h in libsolv before 0.7.17 allows attackers to cause a Denial of Service.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.5% (top 26%)
CISA exploited list	No
Weakness	CWE-787
Published	2021-09-02
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: opensuse

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

Am I affected?

Timeline

2021-09-02 15:15 UTCPublished CVE record published
2026-06-17 03:55 UTCUpdated Record last modified

opensuse libsolv UPGRADE

Affected: <= 0.7.17

Fixed in: newer than 0.7.17

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 0.7.17 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade libsolv

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-2021-33930?

libsolv: upgrade to newer than 0.7.17. Exact commands for each OS are on this page.

Is CVE-2021-33930 being exploited?

CVE-2021-33930 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-2021-33930 affect?

CVE-2021-33930 affects libsolv. Severity is high (CVSS 7.5). Buffer overflow vulnerability in function pool_installable_whatprovides in src/repo.h in libsolv before 0.7.17 allows attackers to cause a Denial of Service.

How urgent is CVE-2021-33930?

Priority 55/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-9150 MEDIUM 6.5 UPGRADE MITIGATE A flaw was found in libsolv
CVE-2026-9149 MEDIUM 6.5 UPGRADE MITIGATE A flaw was found in libsolv
CVE-2026-48864 HIGH 7.8 DOWNGRADE MITIGATE A flaw was found in libsolv
CVE-2021-44568 MEDIUM 6.5 UPGRADE Two heap-overflow vulnerabilities exist in openSUSE/libsolv libsolv through 13 Dec 2020 in the decisionmap var
CVE-2021-3200 LOW 3.3 UPGRADE DOWNGRADE Buffer overflow vulnerability in libsolv 2020-12-13 via the Solver * testcase_read(Pool *pool, FILE *fp, const

References

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