High

Predictable TCP Initial Sequence Numbers in Symantec Raptor and Enterprise Firewall

IdentifiersCVE-2002-1463CWE-342

CVE-2002-1463 is a TCP/IP sequence number predictability flaw in Symantec Raptor Firewall 6.5 and 6.5.3, Enterprise Firewall 6.5.2 and 7.0, VelociRaptor models 500/700/1000 and 1100/1200/1300, and Gateway Security 5110/5200/5300. These products generate easily predictable TCP initial sequence numbers (ISNs) for new connections. Because TCP relies on sufficiently unpredictable ISNs to resist off-path spoofing, an attacker who can model or predict the next sequence number can forge packets that appear to belong to a legitimate connection. Based on the provided context, this maps to CWE-342, predictable exact value from previous values.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

The primary impact is spoofing of TCP connections by a remote attacker. Predictable ISNs reduce the difficulty of blind or off-path TCP spoofing, potentially allowing an attacker to inject packets into a connection or establish forged connections that bypass normal trust assumptions based on source address and TCP state. The exact downstream impact is context-dependent and may include unauthorized communication with protected services, session disruption, or facilitation of further network attacks that depend on successful TCP spoofing.

Mitigation

If you can’t patch tonight, do this now.

If immediate remediation is not possible, reduce exposure to spoofing-dependent attacks by filtering spoofed source addresses at network boundaries, restricting access to trusted services that rely on IP-based trust, and minimizing exposure of management or sensitive TCP services across untrusted networks. More generally, use implementations with stronger entropy sources and PRNG design, consistent with the CWE guidance in the provided content.

Remediation

Patch, then assume compromise.

Upgrade or replace affected Symantec firewall products with versions that generate cryptographically stronger, less predictable TCP initial sequence numbers. The provided content does not include a vendor-fixed version or patch identifier, so specific remediation version information is currently not available. Where possible, use software or platforms with improved randomness/entropy handling for TCP ISN generation.

PUBLIC EXPLOITS

Exploits

No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.

VALID 0 / 1 TOTALView more in app

All candidate exploits were filtered out by Mallory's validation.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType

BroadcomEnterprise Firewallapplication

BroadcomGateway Securityapplication

BroadcomRaptor Firewallapplication

BroadcomVelociraptorapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

2 SOURCESView more in app

paloaltonetworks otherNews

Mar 3, 2014

PCI DSS testing failure

A TCP/IP initial sequence number reuse weakness identified as CVE-2002-1463, referenced here as affecting a Palo Alto firewall running version 5.0.8 during PCI compliance testing.

cwe mitreNews

Jul 19, 2006

CWE - CWE-342: Predictable Exact Value from Previous Values (4.20)

A vulnerability in which a firewall generates easily predictable initial sequence numbers, enabling remote connection spoofing.

What this page doesn’t show

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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity