Critical severity · published Jun 30, 2021
CVE-2021-35474
Stack-based Buffer Overflow vulnerability in cachekey plugin of Apache Traffic Server
9.8
CVSS
2.7%
EPSS
No
On KEV
Description
Stack-based Buffer Overflow vulnerability in cachekey plugin of Apache Traffic Server. 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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)2.7% · higher than 86% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DL
Debian Linux · Debian
10.0 · source: NVD
TS
Traffic Server · Apache
7.0.0 through 7.1.12; 8.0.0 through 8.1.1; 9.0.0 through 9.0.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-35474
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-35474
Mailing List
https://lists.apache.org/thread.html/ra1a41ff92a70d25bf576d7da2590575e8ff430393a3f4a0c34de4277%40%3Cusers.trafficserver.apache.org%3E
Third Party Advisory
https://www.debian.org/security/2021/dsa-4957
More from Traffic Server
10.0
CVE-2026-58162
Apache Traffic Server: Certifier plugin trusts client SNI when generating certificates
10.0
CVE-2026-58150
Apache Traffic Server: HTTP/2 requests with Transfer-Encoding are not rejected, allowing request smuggling
10.0
CVE-2026-57834
Apache Traffic Server: Malformed chunked message body allows request smuggling
9.8
CVE-2026-58185
Apache Traffic Server: Use-after-free in the intercept plugin
9.8
CVE-2026-58179
Apache Traffic Server: regex_remap plugin overflows the stack from attacker input