How severe is CVE-2007-3709?

CVE-2007-3709 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2007-3709 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2007-3709?

CVE-2007-3709 affects Codeigniter. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2007-3709?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2007-3709 published?

CVE-2007-3709 was published on 2007-07-11 and last updated on 2026-06-16.

CVE-2007-3709

CVE-2007-3709 is a medium-severity vulnerability in Codeigniter with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 1% (64th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Codeigniter
Published: 2007-07-11
Last modified: 2026-06-16

Description

CRLF injection vulnerability in the redirect function in url_helper.php in CodeIgniter 1.5.3 allows remote attackers to inject arbitrary HTTP headers via CRLF sequences in an unspecified parameter, as demonstrated by a Set-Cookie header.

Frequently asked questions

What is CVE-2007-3709?: CRLF injection vulnerability in the redirect function in url_helper.php in CodeIgniter 1.5.3 allows remote attackers to inject arbitrary HTTP headers via CRLF sequences in an unspecified parameter, as demonstrated by a Set-Cookie header.
How severe is CVE-2007-3709?: CVE-2007-3709 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2007-3709 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2007-3709?: CVE-2007-3709 affects Codeigniter. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2007-3709?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2007-3709 published?: CVE-2007-3709 was published on 2007-07-11 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:codeigniter:codeigniter:1.5.3:*:*:*:*:*:*:*

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