How severe is CVE-2025-49763?

CVE-2025-49763 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2025-49763 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-49763?

CVE-2025-49763 affects Apache Traffic Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-49763?

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-2025-49763 have an EU (EUVD) identifier?

Yes. CVE-2025-49763 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-18741.

When was CVE-2025-49763 published?

CVE-2025-49763 was published on 2025-06-19 and last updated on 2026-06-17.

CVE-2025-49763

CVE-2025-49763 is a high-severity vulnerability in Apache Traffic Server with a CVSS 3.x base score of 7.5. 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-400.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (46th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-18741
Weakness: CWE-400
Affected product: Apache Traffic Server
Published: 2025-06-19
Last modified: 2026-06-17

Description

ESI plugin does not have the limit for maximum inclusion depth, and that allows excessive memory consumption if malicious instructions are inserted. Users can use a new setting for the plugin (--max-inclusion-depth) to limit it. This issue affects Apache Traffic Server: from 10.0.0 through 10.0.5, from 9.0.0 through 9.2.10. Users are recommended to upgrade to version 9.2.11 or 10.0.6, which fixes the issue.

Frequently asked questions

What is CVE-2025-49763?: ESI plugin does not have the limit for maximum inclusion depth, and that allows excessive memory consumption if malicious instructions are inserted. Users can use a new setting for the plugin (--max-inclusion-depth) to limit it. This issue affects Apache Traffic Server: from 10.0.0 through 10.0.5, from 9.0.0 through 9.2.10. Users are recommended to upgrade to version 9.2.11 or 10.0.6, which fixes the issue.
How severe is CVE-2025-49763?: CVE-2025-49763 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2025-49763 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-49763?: CVE-2025-49763 affects Apache Traffic Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-49763?: 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-2025-49763 have an EU (EUVD) identifier?: Yes. CVE-2025-49763 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-18741.
When was CVE-2025-49763 published?: CVE-2025-49763 was published on 2025-06-19 and last updated on 2026-06-17.

References

https://lists.apache.org/thread/15t32nxbypqg1m2smp640vjx89o6v5f8

Affected products (1)

cpe:2.3:a:apache:traffic_server:*:*:*:*:*:*:*:*

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