CVE-2020-25697

HIGHNVD 7.07.0—

7.0

A privilege escalation flaw was found in the Xorg-x11-server due to a lack of authentication for X11 clients. This flaw allows an attacker to take control of an X application by impersonating the server it is expecting to connect to.

CVSS v3: 7.0
EG Score: 7.0(medium)
EPSS: 15.4%
KEV: Not listed

Published

May 26, 2021

Last Modified

November 21, 2024

References (10)

secalert@redhathttp://www.openwall.com/lists/oss-security/2020/11/09/3
secalert@redhathttp://www.openwall.com/lists/oss-security/2020/11/09/3
secalert@redhathttps://bugzilla.redhat.com/show_bug.cgi?id=1895295
secalert@redhathttps://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%3E
secalert@redhathttps://seclists.org/oss-sec/2020/q4/105
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2020/11/09/3
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2020/11/09/3
af854a3a-2127-422b-91ae-364da2661108https://bugzilla.redhat.com/show_bug.cgi?id=1895295
af854a3a-2127-422b-91ae-364da2661108https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%3E
af854a3a-2127-422b-91ae-364da2661108https://seclists.org/oss-sec/2020/q4/105

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-306Missing Authentication for Critical Function

Data Freshness Timeline

(refreshed 9× in last 7d / 17× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-01 13:50 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 16:07 UTCEG score recompute
2026-05-26 16:07 UTCGHSA enrichment
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-24 16:48 UTCepss_batch

Frequently asked(5)

What is CVE-2020-25697?

CVE-2020-25697 is a high vulnerability published on May 26, 2021. A privilege escalation flaw was found in the Xorg-x11-server due to a lack of authentication for X11 clients. This flaw allows an attacker to take control of an X application by impersonating the server it is expecting to connect to.

When was CVE-2020-25697 disclosed?

CVE-2020-25697 was first published in the National Vulnerability Database on May 26, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2020-25697 actively exploited?

CVE-2020-25697 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 15.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2020-25697?

CVE-2020-25697 has a CVSS v3 base score of 7.0 (NVD).

How do I remediate CVE-2020-25697?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-25697, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2020-25697

📅 Published

🔄 Last Modified

🔗 References (10)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2020-25697?

🔗 Related CVEs(same CWE)

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Published

Last Modified

References (10)

Frequently asked(5)

Related CVEs(same CWE)