How severe is CVE-2020-17508?

CVE-2020-17508 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 high, integrity none, and availability none.

Is CVE-2020-17508 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-17508?

CVE-2020-17508 affects Apache Traffic Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-17508?

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-2020-17508 published?

CVE-2020-17508 was published on 2021-01-11 and last updated on 2026-06-17.

CVE-2020-17508

CVE-2020-17508 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.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (79th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Apache Traffic Server
Published: 2021-01-11
Last modified: 2026-06-17

Description

The ATS ESI plugin has a memory disclosure vulnerability. If you are running the plugin please upgrade. Apache Traffic Server versions 7.0.0 to 7.1.11 and 8.0.0 to 8.1.0 are affected.

Frequently asked questions

What is CVE-2020-17508?: The ATS ESI plugin has a memory disclosure vulnerability. If you are running the plugin please upgrade. Apache Traffic Server versions 7.0.0 to 7.1.11 and 8.0.0 to 8.1.0 are affected.
How severe is CVE-2020-17508?: CVE-2020-17508 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 high, integrity none, and availability none.
Is CVE-2020-17508 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-17508?: CVE-2020-17508 affects Apache Traffic Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-17508?: 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-2020-17508 published?: CVE-2020-17508 was published on 2021-01-11 and last updated on 2026-06-17.

References

https://lists.apache.org/thread.html/r65434f7acca3aebf81b0588587149c893fe9f8f9f159eaa7364a70ff%40%3Cannounce.trafficserver.apache.org%3E

Affected products (1)

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

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