CVE-2005-4077: Multiple off-by-one errors in the cURL library (libcurl) 7.11.2 through 7.15.0 allow local users to trigger a

Routine

MEDIUM 4.6DOWNGRADE

CVE-2005-4077 is a medium-severity flaw (CVSS 4.6) affecting curl. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Multiple off-by-one errors in the cURL library (libcurl) 7.11.2 through 7.15.0 allow local users to trigger a buffer overflow and cause a denial of service or bypass PHP security restrictions via certain URLs that (1) are malformed in a way that prevents a terminating null byte from being added to either a hostname or path buffer, or (2) contain a "?" separator in the hostname portion, which causes a "/" to be prepended to the resulting string.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	4.6 (Medium)
EPSS exploit chance	0.5% (top 56%)
CISA exploited list	No
Weakness	CWE-189
Published	2005-12-08
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: daniel stenberg

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

Am I affected?

Timeline

2005-12-08 01:03 UTCPublished CVE record published
2026-06-16 22:18 UTCUpdated Record last modified

daniel stenberg curl DOWNGRADE

Affected: 7.11.2 · 7.12 · 7.12.1 · 7.12.2 · 7.12.3 · 7.13 · 7.13.1 · 7.13.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 7.11.2

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 7.11.2 (Debian / Ubuntu)

apt-cache madison curl sudo apt install curl=<VERSION_BEFORE_7.11.2> sudo apt-mark hold curl

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

dnf --showduplicates list curl sudo dnf downgrade curl-<VERSION_BEFORE_7.11.2> sudo dnf versionlock add curl

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-2005-4077?

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

Is CVE-2005-4077 being exploited?

CVE-2005-4077 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-2005-4077 affect?

CVE-2005-4077 affects curl. Severity is medium (CVSS 4.6). Multiple off-by-one errors in the cURL library (libcurl) 7.11.2 through 7.15.0 allow local users to trigger a buffer overflow and cause a denial of service or bypass PHP security restrictions via certain URLs that (1) are malformed in a way

How urgent is CVE-2005-4077?

Priority 27/100. No elevated risk signals yet.

Software pages

PHP vulnerabilities · curl vulnerabilities

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References

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