How severe is CVE-2023-25135?

CVE-2023-25135 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-25135 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 24% (98th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-25135?

CVE-2023-25135 primarily affects Vbulletin. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-25135?

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

When was CVE-2023-25135 published?

CVE-2023-25135 was published on 2023-02-03 and last updated on 2026-06-17.

CVE-2023-25135

CVE-2023-25135 is a critical-severity vulnerability in Vbulletin with a CVSS 3.x base score of 9.8. Its EPSS exploit-prediction score of 24% places it in the 98th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-502.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 24% (98th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-502
Affected product: Vbulletin
Published: 2023-02-03
Last modified: 2026-06-17

Description

vBulletin before 5.6.9 PL1 allows an unauthenticated remote attacker to execute arbitrary code via a crafted HTTP request that triggers deserialization. This occurs because verify_serialized checks that a value is serialized by calling unserialize and then checking for errors. The fixed versions are 5.6.7 PL1, 5.6.8 PL1, and 5.6.9 PL1.

Frequently asked questions

What is CVE-2023-25135?: vBulletin before 5.6.9 PL1 allows an unauthenticated remote attacker to execute arbitrary code via a crafted HTTP request that triggers deserialization. This occurs because verify_serialized checks that a value is serialized by calling unserialize and then checking for errors. The fixed versions are 5.6.7 PL1, 5.6.8 PL1, and 5.6.9 PL1.
How severe is CVE-2023-25135?: CVE-2023-25135 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-25135 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 24% (98th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-25135?: CVE-2023-25135 primarily affects Vbulletin. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-25135?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2023-25135 published?: CVE-2023-25135 was published on 2023-02-03 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:vbulletin:vbulletin:5.6.7:-:*:*:*:*:*:*
cpe:2.3:a:vbulletin:vbulletin:5.6.8:-:*:*:*:*:*:*
cpe:2.3:a:vbulletin:vbulletin:5.6.9:-:*:*:*:*:*:*

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