CVE-2007-3564: libcurl 7.14.0 through 7.16.3, when built with GnuTLS support, does not check SSL/TLS certificate expiration o

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HIGH 7.5DOWNGRADE

CVE-2007-3564 is a high-severity flaw (CVSS 7.5) affecting libcurl. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

libcurl 7.14.0 through 7.16.3, when built with GnuTLS support, does not check SSL/TLS certificate expiration or activation dates, which allows remote attackers to bypass certain access restrictions.

Why this priority

High severity

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

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	2.3% (top 17%)
CISA exploited list	No
Published	2007-07-18
Last modified	2026-06-16

Publisher (CNA): Canonical Ltd. · Vendor: libcurl

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2007-07-18 17:30 UTCPublished CVE record published
2026-06-16 22:42 UTCUpdated Record last modified

libcurl libcurl DOWNGRADE

Affected: 7.14 · 7.14.1 · 7.15 · 7.15.1 · 7.15.2 · 7.15.3 · 7.16.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 7.14

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 7.14 (Debian / Ubuntu)

apt-cache madison libcurl sudo apt install libcurl=<VERSION_BEFORE_7.14> sudo apt-mark hold libcurl

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

dnf --showduplicates list libcurl sudo dnf downgrade libcurl-<VERSION_BEFORE_7.14> sudo dnf versionlock add libcurl

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-2007-3564?

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

Is CVE-2007-3564 being exploited?

CVE-2007-3564 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-2007-3564 affect?

CVE-2007-3564 affects libcurl. Severity is high (CVSS 7.5). libcurl 7.14.0 through 7.16.3, when built with GnuTLS support, does not check SSL/TLS certificate expiration or activation dates, which allows remote attackers to bypass certain access restrictions.

How urgent is CVE-2007-3564?

Priority 47/100. High severity

Software pages

curl vulnerabilities · GnuTLS vulnerabilities

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References

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