How severe is CVE-2007-3537?

CVE-2007-3537 has a CVSS 2.0 base score of 7.8, rated high severity.

Is CVE-2007-3537 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (71st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2007-3537?

CVE-2007-3537 primarily affects Ibm Os 400. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2007-3537?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2007-3537 published?

CVE-2007-3537 was published on 2007-07-03 and last updated on 2026-06-16.

CVE-2007-3537

CVE-2007-3537 is a high-severity vulnerability in Ibm Os 400 with a CVSS 2.0 base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 2.0 base score 7.8)
EPSS exploit prediction: 2% (71st percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Ibm Os 400
Published: 2007-07-03
Last modified: 2026-06-16

Description

IBM OS/400 (aka i5/OS) V4R2M0 through V5R3M0 on iSeries machines sends responses to TCP SYN-FIN packets, which allows remote attackers to obtain system information and possibly bypass firewall rules.

Frequently asked questions

What is CVE-2007-3537?: IBM OS/400 (aka i5/OS) V4R2M0 through V5R3M0 on iSeries machines sends responses to TCP SYN-FIN packets, which allows remote attackers to obtain system information and possibly bypass firewall rules.
How severe is CVE-2007-3537?: CVE-2007-3537 has a CVSS 2.0 base score of 7.8, rated high severity.
Is CVE-2007-3537 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (71st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2007-3537?: CVE-2007-3537 primarily affects Ibm Os 400. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2007-3537?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2007-3537 published?: CVE-2007-3537 was published on 2007-07-03 and last updated on 2026-06-16.

References

Affected products (8)

cpe:2.3:o:ibm:os_400:r520:*:*:*:*:*:*:*
cpe:2.3:o:ibm:os_400:v4r2m0:*:*:*:*:*:*:*
cpe:2.3:o:ibm:os_400:v4r3:*:*:*:*:*:*:*
cpe:2.3:o:ibm:os_400:v4r4:*:*:*:*:*:*:*
cpe:2.3:o:ibm:os_400:v4r5:*:*:*:*:*:*:*
cpe:2.3:o:ibm:os_400:v5r1:*:*:*:*:*:*:*
cpe:2.3:o:ibm:os_400:v5r2m0:*:*:*:*:*:*:*
cpe:2.3:o:ibm:os_400:v5r3m0:*:*:*:*:*:*:*

More vulnerabilities in Ibm Os 400

CVE-2006-6836 — Critical (CVSS 10.0): Multiple unspecified vulnerabilities in osp-cert in IBM OS/400 V5R3M0 have unspecified impact and attack vectors,…
CVE-2007-0442 — Medium (CVSS 5.0): Unspecified vulnerability in IBM OS/400 R530 and R535 has unknown impact and remote attack vectors, related to an…
CVE-2005-1182 — Medium (CVSS 5.0): Unknown vulnerability in Incoming Remote Command (iSeries Access for Windows Remote Command service) in IBM OS/400…
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CVE-2008-0694 — Medium (CVSS 4.3): Cross-site scripting (XSS) vulnerability in the HTTP Server in IBM OS/400 V5R3M0 and V5R4M0 allows remote attackers to…
CVE-2005-0899 — Low (CVSS 2.1): AS/400 running OS400 5.2 installs and enables LDAP by default, which allows remote authenticated users to obtain OS/400…

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