Is CVE-2007-4840 in the CISA KEV catalog?

No. CVE-2007-4840 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2007-4840?

CVE-2007-4840 has a CVSS v2 base score of 5.0 (MEDIUM).

What is the EPSS score for CVE-2007-4840?

CVE-2007-4840 has an EPSS score of 3.15% (86th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2007-4840?

Upgrade glibc on debian 11 to 2.7-1 or later.

CVE & CISA-KEV Catalog

CVE-2007-4840

MEDIUMEPSS 86th pctl

5.0

CVSS v2

NVD

Description

PHP 5.2.4 and earlier allows context-dependent attackers to cause a denial of service (application crash) via (1) a long string in the out_charset parameter to the iconv function; or a long string in the charset parameter to the (2) iconv_mime_decode_headers, (3) iconv_mime_decode, or (4) iconv_strlen function. NOTE: this might not be a vulnerability in most web server environments that support multiple threads, unless these issues can be demonstrated for code execution.

CWE-20Improper Input Validation

How to fix

Remediation Available

glibcDebian

Fixed in:2.7-1CVE-2007-4840

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

3.15%probability of exploitation in 30 days

86thpercentile

Elevated risk: more likely to be exploited than 86% of all known CVEs.

References

Other references12

Related Vulnerabilities

Other CWE-20 (Improper Input Validation) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-3400	Critical	10.0	100%	KEV + Ransom	-
CVE-2021-45105	Medium	5.9	100%	-	Fix
CVE-2021-44228	Critical	10.0	100%	KEV + Ransom	Fix
CVE-2021-21985	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2018-7600	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2020-3452	High	7.5	100%	KEV	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-23.