The wordwrap function in PHP 4 before 4.4.8, and PHP 5 before 5.2.4, does not properly use the breakcharlen variable, which allows remote attackers to cause a denial of service (divide-by-zero error and application crash, or infinite loop) via certain arguments, as demonstrated by a 'chr(0), 0, ""' argument set.
CVE-2007-3998
MEDIUMCVSS v2 · 5.05.0—
EchelonGraph scoreLOW confidence
This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 5.0 — v2 rates that MEDIUM (v2 bands: LOW 0.0–3.9 / MEDIUM 4.0–6.9 / HIGH 7.0–10.0; v2 has no CRITICAL band). Vector AV:N/AC:L/Au:N/C:N/I:N/A:P. CVSS v2 is an older, coarser metric than v3.1/v4.0 (no Scope, no User Interaction, no Attack Requirements), so it is not directly comparable to a v3 or v4 score. NVD has never re-scored this record under v3. EPSS predicts 3.0% exploitation probability in the next 30 days, which is reflected in EG Risk but does not lift the v2 base. Confidence: LOW.
Triggered by: NVD CVSS v2.0 (legacy fallback)
Sources: epss, nvd_v2
5.0EG
EchelonGraph verdictMonitorRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 3.0%CVSS v2: 5.0Exploit: None knownExposed services: Not assessed
A fix is available — apply it.
- CVSS v2.0 (legacy)
- 5.0MEDIUMNVD never assigned a CVSS v3 rating to this CVE
- EG Score
- 5.0MEDIUMlow confidence
- EG Risk
- 28EG Risk 28/100
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computed (value × EchelonGraph’s weight)Severity50% × 45%The EG Score, 5.0 of 10.Exploitation3% × 40%FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.Automatability30% × 15%EchelonGraph's default before algorithm v3.4: CISA had not published Automatable for this CVE.SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track or Track* or Attend at high (mission-essential systems).Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact unknown (not published for this CVE). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high. - EPSS PROB
- 3.0%
- EPSS %ILE
- 86th
- KEV
- Not listed
SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track or Track* or Attend at high (mission-essential systems).
A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact unknown (not published for this CVE). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table
Published
September 4, 2007
Last Modified
April 23, 2026
References (35)
- MITRE · CVE Programhttp://lists.opensuse.org/opensuse-security-announce/2008-01/msg00006.htmlThird Party Advisory
- MITRE · CVE Programhttp://rhn.redhat.com/errata/RHSA-2007-0889.htmlThird Party Advisory
- MITRE · CVE Programhttp://secunia.com/advisories/26642Third Party Advisory
- MITRE · CVE Programhttp://secunia.com/advisories/26822Third Party Advisory
- MITRE · CVE Programhttp://secunia.com/advisories/26838Third Party Advisory
- MITRE · CVE Programhttp://secunia.com/advisories/26871Third Party Advisory
- MITRE · CVE Programhttp://secunia.com/advisories/26895Third Party Advisory
- MITRE · CVE Programhttp://secunia.com/advisories/26930Third Party Advisory
- MITRE · CVE Programhttp://secunia.com/advisories/26967Third Party Advisory
- MITRE · CVE Programhttp://secunia.com/advisories/27102Third Party Advisory
- MITRE · CVE Programhttp://secunia.com/advisories/27377Third Party Advisory
- MITRE · CVE Programhttp://secunia.com/advisories/27545Third Party Advisory
- MITRE · CVE Programhttp://secunia.com/advisories/27864Third Party Advisory
- MITRE · CVE Programhttp://secunia.com/advisories/28249Third Party Advisory
- MITRE · CVE Programhttp://secunia.com/advisories/28658Third Party Advisory
15 of 35 shown · show the other 20
- MITRE · CVE Programhttp://secunia.com/advisories/30288Third Party Advisory
- MITRE · CVE Programhttp://secweb.se/en/advisories/php-wordwrap-vulnerability/Third Party Advisory
- MITRE · CVE Programhttp://support.avaya.com/elmodocs2/security/ASA-2007-449.htmThird Party Advisory
- MITRE · CVE Programhttp://www.debian.org/security/2008/dsa-1444Third Party Advisory
- MITRE · CVE Programhttp://www.debian.org/security/2008/dsa-1578Third Party Advisory
- MITRE · CVE Programhttp://www.gentoo.org/security/en/glsa/glsa-200710-02.xmlThird Party Advisory
- MITRE · CVE Programhttp://www.mandriva.com/security/advisories?name=MDKSA-2007:187Third Party Advisory
- MITRE · CVE Programhttp://www.php.net/ChangeLog-5.php#5.2.4Vendor Advisory
- MITRE · CVE Programhttp://www.php.net/releases/5_2_4.phpVendor Advisory
- MITRE · CVE Programhttp://www.redhat.com/support/errata/RHSA-2007-0890.htmlThird Party Advisory
- MITRE · CVE Programhttp://www.redhat.com/support/errata/RHSA-2007-0891.htmlThird Party Advisory
- MITRE · CVE Programhttp://www.trustix.org/errata/2007/0026/Broken Link
- MITRE · CVE Programhttp://www.ubuntu.com/usn/usn-549-2Third Party Advisory
- MITRE · CVE Programhttp://www.vupen.com/english/advisories/2007/3023Permissions Required · Third Party Advisory
- MITRE · CVE Programhttps://issues.rpath.com/browse/RPL-1693Broken Link
- MITRE · CVE Programhttps://issues.rpath.com/browse/RPL-1702Broken Link
- MITRE · CVE Programhttps://launchpad.net/bugs/173043Third Party Advisory
- MITRE · CVE Programhttps://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10603Third Party Advisory
- MITRE · CVE Programhttps://usn.ubuntu.com/549-1/Third Party Advisory
- MITRE · CVE Programhttps://www.redhat.com/archives/fedora-package-announce/2007-September/msg00354.htmlThird Party Advisory
Patch Availability(4)
| Vendor / Ecosystem | Fix (by version range) / Patch | Released | Source |
|---|---|---|---|
| ubuntu | libapache2-mod-php5 (5.2.3-1ubuntu6.1) @ gutsy | 2026-05-31 | ubuntu |
| redhat | php-0:5.1.6-3.el4s1.8 | 2007-10-25 | redhat |
| redhat | php-0:4.3.2-43.ent | 2007-09-26 | redhat |
| redhat | php-0:5.1.6-15.el5 | 2007-09-20 | redhat |
Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.
Affected Packages
(3 across 2 ecosystems)
Debian:4.0(2)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| php4 | 6:4.4.4-8+etch1, 6:4.4.4-8+etch2, 6:4.4.4-8+etch3, 6:4.4.4-8+etch4 |
| — |
| php5 | 5.2.0-8+etch1 ... 5.2.0-8+etch9~bpo31+1 (8 versions) |
| — |
Debian:5.0(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| php5 | — |
| — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
All Vendor Advisories
(4)
Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.
Data Freshness Timeline
(refreshed 8× in last 7d / 16× in last 30d)
Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.
Showing the most recent 79 of 103 refreshes on record for this CVE.
A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 21 repeat rows among the latest 100 are merged into the row they repeat. The 24 oldest rows on record are not shown and were not checked, so the counts can still include repeats.
- 2026-10-11 13:37 UTCEPSS rescoreEPSS 3.0% · 86th percentile
- 2026-10-10 19:53 UTCEPSS rescoreEPSS 3.0% · 86th percentile
- 2026-10-09 20:00 UTCEPSS rescoreEPSS 3.0% · 86th percentile
- 2026-10-08 16:33 UTCEPSS rescoreEPSS 3.0% · 86th percentile
- 2026-10-07 23:37 UTCEPSS rescoreEPSS 3.0% · 86th percentile
- 2026-10-06 15:09 UTCEPSS rescoreEPSS 3.0% · 86th percentile
- 2026-10-05 17:37 UTCEPSS rescoreEPSS 3.0% · 86th percentile
- 2026-10-04 23:15 UTCEPSS rescoreEPSS 3.0% · 86th percentile
- 2026-10-03 14:20 UTCEPSS rescoreEPSS 3.0% · 86th percentile
- 2026-10-01 19:42 UTCEPSS rescoreEPSS 3.0% · 86th percentile
- 2026-09-30 14:57 UTCEPSS rescoreEPSS 3.0% · 86th percentile
- 2026-09-29 07:43 UTCEG score recompute
- 2026-09-18 19:20 UTCEPSS rescoreEPSS 3.0% · 86th percentile
- 2026-09-17 19:20 UTCEPSS rescoreEPSS 3.0% · 86th percentile
- 2026-09-15 03:04 UTCEPSS rescoreEPSS 3.0% · 86th percentile
- 2026-09-12 14:54 UTCEPSS rescoreEPSS 3.0% · 86th percentile
- 2026-09-05 15:22 UTCEPSS rescoreEPSS 3.0% · 86th percentile
- 2026-09-04 13:55 UTCEPSS rescoreEPSS 3.0% · 86th percentile
- 2026-09-04 04:59 UTCEPSS rescoreEPSS 3.0% · 86th percentile
- 2026-08-30 01:14 UTCEPSS rescoreEPSS 3.0% · 86th percentile
- 2026-08-08 16:30 UTCEPSS rescoreEPSS 3.0% · 86th percentile
- 2026-08-07 16:20 UTCEPSS rescoreEPSS 3.0% · 86th percentile
- 2026-08-06 13:41 UTCEPSS rescoreEPSS 3.0% · 86th percentile
- 2026-08-05 19:11 UTCEPSS rescoreEPSS 3.0% · 86th percentile
- 2026-08-04 15:03 UTCEPSS rescoreEPSS 3.0% · 86th percentile
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- 2026-08-03 10:28 UTCEPSS rescoreEPSS 3.0% · 85th percentile
- 2026-07-30 16:22 UTCEPSS rescoreEPSS 3.0% · 85th percentile
- 2026-07-30 01:25 UTCEPSS rescoreEPSS 3.0% · 85th percentile
- 2026-07-28 15:30 UTCEPSS rescoreEPSS 3.0% · 85th percentile
- 2026-07-26 13:33 UTCEG score recompute▲ 5.00
- 2026-07-25 14:12 UTCEPSS rescoreEPSS 3.0% · 85th percentile
- 2026-07-24 14:11 UTCEPSS rescoreEPSS 3.0% · 85th percentile
- 2026-07-23 14:13 UTCEPSS rescoreEPSS 3.0% · 85th percentile
- 2026-07-23 00:54 UTCEG score recompute
- 2026-07-23 00:33 UTCEG score recompute
- 2026-07-22 23:58 UTCEG score recompute
- 2026-07-22 21:37 UTCEG score recompute
- 2026-07-22 14:03 UTCEPSS rescoreEPSS 3.0% · 85th percentile
- 2026-07-21 15:19 UTCEPSS rescoreEPSS 3.0% · 85th percentile
- 2026-07-20 17:03 UTCEPSS rescoreEPSS 3.0% · 85th percentile
- 2026-07-18 09:59 UTCEPSS rescoreEPSS 3.0% · 85th percentile
- 2026-07-16 16:58 UTCEPSS rescoreEPSS 3.0% · 85th percentile
- 2026-07-15 16:54 UTCEPSS rescoreEPSS 3.0% · 85th percentile
- 2026-07-15 01:55 UTCEPSS rescoreEPSS 3.0% · 85th percentile
- 2026-07-11 08:22 UTCEPSS rescoreEPSS 3.0% · 85th percentile
- 2026-07-08 15:09 UTCEPSS rescoreEPSS 3.0% · 85th percentile
- 2026-07-06 16:22 UTCEPSS rescoreEPSS 3.0% · 85th percentile
- 2026-07-06 02:19 UTCEPSS rescoreEPSS 3.0% · 85th percentile
- 2026-07-05 02:26 UTCEPSS rescoreEPSS 3.0% · 85th percentile
- 2026-07-04 06:27 UTCEPSS rescoreEPSS 3.0% · 85th percentile
- 2026-07-02 14:00 UTCEPSS rescoreEPSS 3.0% · 85th percentile
- 2026-07-01 15:02 UTCEPSS rescoreEPSS 3.0% · 85th percentile
- 2026-06-30 23:19 UTCEPSS rescoreEPSS 3.0% · 85th percentile
- 2026-06-29 14:02 UTCEPSS rescoreEPSS 3.0% · 85th percentile
- 2026-06-28 14:03 UTCEPSS rescoreEPSS 3.0% · 85th percentile
- 2026-06-28 04:52 UTCEPSS rescoreEPSS 3.0% · 85th percentile
- 2026-06-27 03:04 UTCEPSS rescoreEPSS 3.0% · 85th percentile
- 2026-06-25 13:46 UTCEPSS rescoreEPSS 3.0% · 85th percentile
- 2026-06-24 14:02 UTCEPSS rescoreEPSS 3.0% · 85th percentile
- 2026-06-23 21:29 UTCEPSS rescoreEPSS 3.0% · 85th percentile
- 2026-06-22 14:22 UTCEPSS rescoreEPSS 3.0% · 85th percentile
- 2026-06-21 01:56 UTCEPSS rescoreEPSS 3.0% · 85th percentile
- 2026-06-19 19:22 UTCEPSS rescoreEPSS 3.0% · 85th percentile
- 2026-06-18 17:49 UTCEPSS rescoreEPSS 3.0% · 85th percentile
- 2026-06-17 17:49 UTCEPSS rescoreEPSS 3.0% · 85th percentile
- 2026-06-16 17:49 UTCEPSS rescoreEPSS 3.0% · 85th percentile
- 2026-06-15 17:44 UTCEPSS rescoreEPSS 3.0% · 85th percentile
- 2026-06-13 22:57 UTCEPSS rescoreEPSS 6.4% · 91st percentile
- 2026-06-12 23:08 UTCEPSS rescoreEPSS 6.4% · 91st percentile
- 2026-06-10 22:14 UTCEPSS rescoreEPSS 6.4% · 91st percentile
- 2026-06-10 13:17 UTCEPSS rescoreEPSS 6.4% · 91st percentile
- 2026-06-08 14:13 UTCEPSS rescoreEPSS 6.4% · 91st percentile
- 2026-06-07 15:21 UTCEPSS rescoreEPSS 6.4% · 91st percentile
- 2026-06-05 22:44 UTCEPSS rescoreEPSS 6.4% · 91st percentile
- 2026-06-05 06:07 UTCEPSS rescoreEPSS 6.4% · 91st percentile
- 2026-06-04 13:09 UTCEPSS rescoreEPSS 6.4% · 91st percentile
- 2026-06-02 20:10 UTCEPSS rescoreEPSS 6.4% · 91st percentile
- 2026-06-01 13:49 UTCEPSS rescoreEPSS 6.4% · 91st percentile
- 2026-05-31 22:28 UTCEPSS rescoreEPSS 6.4% · 91st percentile
Related CVEs(same product + same vendor + same CWE)
Same product
10 shownDebian:4.0:php4
- CVE-2008-2051EG 10.0HIGH
- CVE-2007-1718EG 7.8EPSS p94HIGH
- CVE-2007-4657EG 7.5HIGH
- CVE-2007-1777EG 7.5EPSS p97HIGH
- CVE-2007-3806EG 6.8EPSS p96MEDIUM
- CVE-2007-1583EG 6.8EPSS p92MEDIUM
- CVE-2007-1521EG 6.8EPSS p95MEDIUM
- CVE-2007-1286EG 6.8EPSS p99MEDIUM
- CVE-2007-1380EG 5.0EPSS p95MEDIUM
- CVE-2007-3799EG 4.3EPSS p95MEDIUM
Same vendor
10 shownredhat:RHSA-2007:0889 · ubuntu:USN-549-1
Frequently asked(4)
What is CVE-2007-3998?
CVE-2007-3998 is a medium-severity vulnerability; its CVE record was published on September 4, 2007. The wordwrap function in PHP 4 before 4.4.8, and PHP 5 before 5.2.4, does not properly use the breakcharlen variable, which allows remote attackers to cause a denial of service (divide-by-zero error and application crash, or infinite loop) via certain arguments, as demonstrated by a 'chr(0), 0, ""'…
When was CVE-2007-3998 made public?
CVE-2007-3998 was made public on August 30, 2007: that is the date its CVE record's CNA, MITRE Corporation, gives for when the vulnerability was made public. The CVE record itself was published on September 4, 2007. EchelonGraph's copy of the record carries a last-modified date of April 23, 2026; the record at its source may have been updated since.
Is CVE-2007-3998 actively exploited?
CVE-2007-3998 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3.0% probability of exploitation in the next 30 days (86th percentile of EPSS-scored CVEs).
How do I remediate CVE-2007-3998?
A fix for CVE-2007-3998 is available: update to the fixed version the vendor names in its advisory.
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2007-3998
Is Your Infrastructure Affected by CVE-2007-3998?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.