What’s Vulnerable › Vulnerabilities

CVE-2021-27577: Incorrect handling of url fragment leads to cache poisoning

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-06-29 · updated 2026-06-17
• Weakness: CWE-444

Description

Incorrect handling of url fragment vulnerability of Apache Traffic Server allows an attacker to poison the cache. This issue affects Apache Traffic Server 7.0.0 to 7.1.12, 8.0.0 to 8.1.1, 9.0.0 to 9.0.1.

Affected products

• Apache Software Foundation Apache Traffic Server: from 7.0.0 through 7.1.12; from 8.0.0 through 8.1.1; from 9.0.0 through 9.0.1
• Debian Linux: 8.0

References

• https://lists.apache.org/thread.html/ra1a41ff92a70d25bf576d7da2590575e8ff430393a3f4a0c34de4277%40%3Cusers.trafficserver.apache.org%3E
• https://www.debian.org/security/2021/dsa-4957
• https://lists.apache.org/thread.html/ra1a41ff92a70d25bf576d7da2590575e8ff430393a3f4a0c34de4277%40%3Cusers.trafficserver.apache.org%3E
• https://www.debian.org/security/2021/dsa-4957

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