How severe is CVE-2025-67896?

CVE-2025-67896 has a CVSS 3.x base score of 7.0, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity high, and availability low.

Is CVE-2025-67896 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-67896?

CVE-2025-67896 affects Exim. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-67896?

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.

Does CVE-2025-67896 have an EU (EUVD) identifier?

Yes. CVE-2025-67896 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-203281.

When was CVE-2025-67896 published?

CVE-2025-67896 was published on 2025-12-14 and last updated on 2026-06-17.

CVE-2025-67896

CVE-2025-67896 is a high-severity vulnerability in Exim with a CVSS 3.x base score of 7.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-122.

Key facts

Severity: High (CVSS 3.x base score 7.0)
EPSS exploit prediction: 0% (32nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-203281
Weakness: CWE-122
Affected product: Exim
Published: 2025-12-14
Last modified: 2026-06-17

Description

Exim before 4.99.1, with certain non-default rate-limit configurations, allows a remote heap-based buffer overflow because database records are cast directly to internal structures without validation.

Frequently asked questions

What is CVE-2025-67896?: Exim before 4.99.1, with certain non-default rate-limit configurations, allows a remote heap-based buffer overflow because database records are cast directly to internal structures without validation.
How severe is CVE-2025-67896?: CVE-2025-67896 has a CVSS 3.x base score of 7.0, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity high, and availability low.
Is CVE-2025-67896 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-67896?: CVE-2025-67896 affects Exim. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-67896?: 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.
Does CVE-2025-67896 have an EU (EUVD) identifier?: Yes. CVE-2025-67896 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-203281.
When was CVE-2025-67896 published?: CVE-2025-67896 was published on 2025-12-14 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:exim:exim:*:*:*:*:*:*:*:*

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Threat intelligence

Threat-intel indicators referencing this CVE:

193.202.11.112 (ipv4-addr)
76.12.128.249 (ipv4-addr)
50.116.72.139 (ipv4-addr)
166.62.41.190 (ipv4-addr)
160.187.147.124 (ipv4-addr)
132.148.155.138 (ipv4-addr)
77.221.151.241 (ipv4-addr)
37.221.254.200 (ipv4-addr)