CVE-2021-41585
ATS stops accepting connections on FreeBSD
Improper Input Validation vulnerability in accepting socket connections in Apache Traffic Server allows an attacker to make the server stop accepting new connections. This issue affects Apache Traffic Server 5.0.0 to 9.1.0.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
Improper Input Validation vulnerability in accepting socket connections in Apache Traffic Server allows an attacker to make the server stop accepting new connections. This issue affects Apache Traffic Server 5.0.0 to 9.1.0.
- Record
CVE-2021-41585- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:N/I:N/A:P - Weakness
- CWE-20
- Updated
- 2026-11-02
CVE ListNo score
ATS stops accepting connections on FreeBSD
Improper Input Validation vulnerability in accepting socket connections in Apache Traffic Server allows an attacker to make the server stop accepting new connections. This issue affects Apache Traffic Server 5.0.0 to 9.1.0.
- Record
CVE-2021-41585- Updated
- 2026-11-02
EUVDEUVD-2021-28599No score
Improper Input Validation vulnerability in accepting socket connections in Apache Traffic Server allows an attacker to make the server stop accepting new connections. This issue affects Apache Traffic Server 5.0.0 to 9.1.0.
- Record
EUVD-2021-28599- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-7p26-vh5r-gh69No score
Improper Input Validation vulnerability in accepting socket connections in Apache Traffic Server...
Improper Input Validation vulnerability in accepting socket connections in Apache Traffic Server allows an attacker to make the server stop accepting new connections. This issue affects Apache Traffic Server 5.0.0 to 9.1.0.
- Record
GHSA-7p26-vh5r-gh69- Weakness
- CWE-20
- Updated
- 2026-11-02
OSV
Improper Input Validation vulnerability in accepting socket connections in Apache Traffic Server allows an attacker to make the server stop accepting new connections. This issue affects Apache Traffic Server 5.0.0 to 9.1.0.
- Record
CVE-2021-41585- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVOESA-2021-1437
trafficserver security update
Apache Traffic Server is an OpenSource HTTP / HTTPS / HTTP/2 / QUIC reverse, forward and transparent proxy and cache.
Security Fix(es):
Improper input validation vulnerability in header parsing of Apache Traffic Server allows an attacker to smuggle requests. This issue affects Apache Traffic Server 8.0.0 to 8.1.2 and 9.0.0 to 9.1.0.(CVE-2021-37147)
Improper Input Validation vulnerability in header parsing of Apache Traffic Server allows an attacker to smuggle requests. This issue affects Apache Traffic Server 8.0.0 to 8.1.2 and 9.0.0 to 9.1.0.(CVE-2021-37149)
Improper Input Validation vulnerability in accepting socket connections in Apache Traffic Server allows an attacker to make the server stop accepting new connections. This issue affects Apache Traffic Server 5.0.0 to 9.1.0.(CVE-2021-41585)
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability in the stats-over-http plugin of Apache Traffic Server allows an attacker to overwrite memory. This issue affects Apache Traffic Server 9.1.0.(CVE-2021-43082)
- Record
OESA-2021-1437- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVUBUNTU-CVE-2021-41585
Improper Input Validation vulnerability in accepting socket connections in Apache Traffic Server allows an attacker to make the server stop accepting new connections. This issue affects Apache Traffic Server 5.0.0 to 9.1.0.
- Record
UBUNTU-CVE-2021-41585- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
trafficserveropenEuler:20.03-LTS-SP1 From an advisory covering 4 CVEs | before 9.1.0-4.oe1 | 9.1.0-4.oe1 |
trafficserveropenEuler:20.03-LTS-SP2 From an advisory covering 4 CVEs | before 9.1.0-4.oe1 | 9.1.0-4.oe1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, facts | ||
| affected | ||
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-41585 is a high vulnerability (CVSS 7.5) in Apache Traffic Server, published November 3, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.49%, the 84th percentile. No source names a fixed version.
References
lists.apache.org/thread/k01797hyncx53659wr3o72s5cvkc3164
nvd.nist.gov/vuln/detail/CVE-2021-41585
github.com/advisories/GHSA-7p26-vh5r-gh69
openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2021-1437
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ubuntu.com/security/CVE-2021-41585
openwall.com/lists/oss-security/2021/11/02/11
cve.org/CVERecord?id=CVE-2021-41585