CVE-2004-0230 — TCP, when using a large Window Size, makes it easier for remote attackers to guess…
TCP, when using a large Window Size, makes it easier for remote attackers to guess sequence numbers and cause a denial of service (connection loss) to persistent TCP connections by repeatedly injecting a TCP RST packet, especially in protocols that use long-lived connections, such as BGP.
Who exploits it and how urgent it is
A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.
How the score was calculated
- Public exploit/PoC (exploitdb)+8
- EPSS 80.3% (30-day exploitation probability)+15
- Technical severity (medium)+3
- Automatable exploitation (SSVC)+3
The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).
Triage
Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.
CISA SSVC assessment CISA
Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.
Remediation
Fixes and mitigations documented by the sources — linked to the original advisory.
- Documented patch — www.oracle.com (NIST National Vulnerability Database)
- Documented patch — kc.mcafee.com (NIST National Vulnerability Database)
First 24 hours
Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.
- Identify exposed assets running the affected vendor/product/version combinations (Juniper Networks Junos, Mcafee Network Data Loss Prevention, Microsoft Windows 2000…).
- The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
- Apply the fixed version or the patch documented under Remediation.
- EPSS ahead of 100% of scored CVEs: prioritize it in the patch queue.
- Search available logs for exploit probes, errors and authentication anomalies.
Affected scope
Vendor, product and versions as the sources word them.
| Vendor | Product | Versions | Status | Source |
|---|---|---|---|---|
| Juniper Networks | Junos |
version 12.3-r2version 12.1x46-d10version 12.1x46-d15version 12.1x47version 12.2version 12.2-r1version 12.2-r2version 12.2-r3 and 47 moreversion 12.2-r4version 12.2-r5version 12.2-r6version 12.2-r7version 12.3version 12.3-r1version 11.4version 12.3-r3version 12.3-r4version 12.3-r5version 13.1version 13.1-r1version 13.1-r2version 13.1-r3version 13.2version 13.2-r1version 13.2-r2version 13.2-r3version 13.3version 13.3-r1version 12.1x45-d20version 12.1x46< 11.4version 11.4-r1version 11.4-r10version 11.4-r2version 11.4-r3version 11.4-r4version 11.4-r5version 11.4-r6version 11.4-r7version 11.4-r8version 11.4-r9version 11.4r13-s2version 12.1version 12.1x45-d15version 12.1x45-d10version 12.1x45version 12.1x44-d35version 12.1x44-d30version 12.1x44-d25version 12.1x44-d20version 12.1x44-d15version 12.1x44-d10version 12.1x44version 12.1rversion 11.4x27 |
Vulnerable | NIST National Vulnerability Database |
| Mcafee | Network Data Loss Prevention | version 9.2.2version 9.2.1version 9.2.0≤ 8.6 | Vulnerable | NIST National Vulnerability Database |
| Microsoft | Windows 2000 | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Microsoft | Windows 98 | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Microsoft | Windows 98se | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Microsoft | Windows Server 2003 | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Microsoft | Windows Xp | versions not specified by the source | Vulnerable | NIST National Vulnerability Database |
| Netbsd | Netbsd | version 2.0version 1.5version 1.5.1version 1.5.2version 1.5.3version 1.6version 1.6.1version 1.6.2 | Vulnerable | NIST National Vulnerability Database |
| Openpgp | Openpgp | version 2.6.2 | Vulnerable | NIST National Vulnerability Database |
| Oracle | Solaris | version 10version 11 | Vulnerable | NIST National Vulnerability Database |
| Xinuos | Openserver | version 5.0.6version 5.0.7 | Vulnerable | NIST National Vulnerability Database |
| Xinuos | Unixware | version 7.1.1version 7.1.3 | Vulnerable | NIST National Vulnerability Database |
Attack characteristics
The CVSS vector, decoded. It describes the attack, not your exposure to it.
Every base score collected
Sources score independently and may disagree; each row says who scored it and under which version.
| Score | Version | Severity | Expl. | Impact | Scored by |
|---|---|---|---|---|---|
| 5.0 | CVSS 2.0 | Medium | 10.0 | 2.9 | nvd@nist.gov via NIST National Vulnerability Database |
AV:N/AC:L/Au:N/C:N/I:N/A:P (score shown at the top: nvd@nist.gov) Public exploits, PoCs and detection templates
Public code that demonstrates or tests the flaw raises the odds of mass exploitation — and Nuclei templates help find vulnerable assets in your environment.
- Multiple Vendor - TCP Sequence Number Approximation (1) verified Mar 5, 2004
- Multiple Vendor - TCP Sequence Number Approximation (2) verified Apr 20, 2004
- Multiple Vendor - TCP Sequence Number Approximation (3) verified Apr 20, 2004
- Microsoft Windows XP/2000 - TCP Connection Reset verified Apr 22, 2004
- TCP Connection Reset - Remote Denial of Service verified Apr 23, 2004
- Multiple Vendor - TCP Sequence Number Approximation (4) verified Apr 23, 2004
- Microsoft Windows - Malformed IP Options Denial of Service (MS05-019) verified Apr 17, 2005
Warning: public PoCs are sometimes disguised malware. Use them only for authorized testing in an isolated environment. This portal does not host exploit code — it only points to the sources.
EPSS over time FIRST
Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 80.29%
Detection
Read off the CVSS vector and the weakness class. Starting points, not tested rules.
- Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
Timeline
What happened to this CVE, newest first.
- 2026
- SSVC assessment updated
- Record published
- Fix documented
- CVSS changed · 5.0
- Source status changed · → Analyzed
- Record created in this database
- 2004
- CVE published
Source activity
Repeated readings are counted rather than listed.
- 1× Official description updated · Oct 13, 2026 – Oct 13, 2026
References
24 on the record
- www.oracle.com/technetwork/topics/security/cpujan2015-1972971.html
- kc.mcafee.com/corporate/index
- www.vupen.com/english/advisories/2006/3983
- secunia.com/advisories/11458
- oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A2689
- www.us-cert.gov/cas/techalerts/TA04-111A.html
- www.uniras.gov.uk/vuls/2004/236929/index.htm
- docs.microsoft.com/en-us/security-updates/securitybulletins/2006/ms06-064
- oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A3508
- exchange.xforce.ibmcloud.com/vulnerabilities/15886
- marc.info/
- secunia.com/advisories/11440
- www.securityfocus.com/bid/10183
- docs.microsoft.com/en-us/security-updates/securitybulletins/2005/ms05-019
- oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5711
- oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A4791
- oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A270
- www.cisco.com/warp/public/707/cisco-sa-20040420-tcp-ios.shtml
- www.osvdb.org/4030
- www.securityfocus.com/archive/1/449179/100/0/threaded
- www.kb.cert.org/vuls/id/415294
- kb.juniper.net/JSA10638
- marc.info/
- secunia.com/advisories/22341
Elsewhere on this site
Related CVEs (same products)
- High CVE-2026-53996 NetBSD hdaudio(4) Driver Privilege Bypass Use-After-Free via HDAUDIO_FGRP_SETCONFIG ioctl Aug 12, 2026
- High CVE-2026-61202 Improper Access Control in Oracle Solaris Jul 21, 2026
- Medium CVE-2026-61052 Uncontrolled Resource Consumption in Oracle Solaris Jul 21, 2026
- High CVE-2026-60834 Improper Access Control in Oracle Solaris Jul 21, 2026
- High CVE-2026-60833 Improper Privilege Management in Oracle Solaris Jul 21, 2026
- High CVE-2026-60661 Improper Privilege Management in Oracle Solaris Jul 21, 2026
Not in any source we poll
Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.
- No CWE classification.
- No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
- No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
- No exploit packet captures, log samples, or incident case IDs supplied.
Answered from this record
Text assembled only from the fields above — no additional claims.
What should defenders know first?
CVE-2004-0230 is "TCP, when using a large Window Size, makes it easier for remote attackers to guess…", rated Medium. It affects Junos (Juniper Networks); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 5.0 describes technical severity. EPSS 80.29% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.
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