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CVE-2020-9494

20
FAUCET Score

CVE-2020-9494 describes a denial-of-service vulnerability in Apache Traffic Server versions 6.0.0-6.2.3, 7.0.0-7.1.10, and 8.0.0-8.0.7, where specially crafted HTTP/2 HEADERS frames can lead to excessive memory allocation and thread spinning. This vulnerability has a CVSS score of 7.5 (High), indicating a network-exploitable attack with low complexity, requiring no privileges or user interaction, and resulting in high availability impact. While the EPSS score is low and there is no evidence of active exploitation, public exploit code, or significant community discussion, organizations using affected versions should still consider patching.

Impacted Technologies

VendorProductVersion(s)CPE
>= 6.0.0, <= 6.2.3CPE matchmatch criteria
cpe:2.3:a:apache:traffic_server:*:*:*:*:*:*:*:*
>= 7.0.0, <= 7.1.10CPE matchmatch criteria
cpe:2.3:a:apache:traffic_server:*:*:*:*:*:*:*:*
>= 8.0.0, <= 8.0.7CPE matchmatch criteria
cpe:2.3:a:apache:traffic_server:*:*:*:*:*:*:*:*
10.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
3.91%
Probability of exploitation in next 30 days
EPSS Percentile
89.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0391 is in the 81st percentile among its peer group of 51,553 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

lists.apache.org / thread.html/rf7f86917f42fdaf904d99560cba0c016e03baea6244c47efeb60ecbe%40%3Cdev.trafficserver.apache.org%3E
Mailing ListVendor Advisory
debian.org / security/2020/dsa-4710
Third Party Advisory
openwall.com / lists/oss-security/2021/03/01/2
Not Applicable