CVE-2021-43082
heap-buffer-overflow with stats-over-http plugin
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.
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
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2021-43082- 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 - CVSS 2.0
- 7.5 High
AV:N/AC:L/Au:N/C:P/I:P/A:P - Weakness
- CWE-120
- Updated
- 2026-11-02
CVE ListNo score
heap-buffer-overflow with stats-over-http plugin
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.
- Record
CVE-2021-43082- Weakness
- CWE-120
- Updated
- 2026-11-02
EUVDEUVD-2021-30035No score
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.
- Record
EUVD-2021-30035- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-6mp9-9wj5-hg44No score
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability in the stats...
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.
- Record
GHSA-6mp9-9wj5-hg44- Weakness
- CWE-120
- Updated
- 2026-11-02
OSV
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.
- Record
CVE-2021-43082- 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
OSVDEBIAN-CVE-2021-43082
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.
- Record
DEBIAN-CVE-2021-43082- 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
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-2021-43082
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.
- Record
UBUNTU-CVE-2021-43082- 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
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
trafficserverDebian:12 | before 9.1.1+ds-1 | 9.1.1+ds-1 |
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-2021-43082 is a critical vulnerability (CVSS 9.8) 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 2.41%, the 84th percentile. Fixed in trafficserver 9.1.1+ds-1.
References
lists.apache.org/thread/k01797hyncx53659wr3o72s5cvkc3164
nvd.nist.gov/vuln/detail/CVE-2021-43082
github.com/advisories/GHSA-6mp9-9wj5-hg44
security-tracker.debian.org/tracker/CVE-2021-43082
openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2021-1437
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ubuntu.com/security/CVE-2021-43082
openwall.com/lists/oss-security/2021/11/02/11
cve.org/CVERecord?id=CVE-2021-43082