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Fencer Vulns
high 7.5

CVE-2023-39456 in the critical feed json

Apache Traffic Server: Malformed http/2 frames can cause an abort

published 2023-10-17 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-43179

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
58.3%
EPSS 58.3% chance of exploitation in 30 days, percentile 99.1%
public exploits
0
none known

Summary

Improper Input Validation vulnerability in Apache Traffic Server with malformed HTTP/2 frames.This issue affects Apache Traffic Server: from 9.0.0 through 9.2.2.

Users are recommended to upgrade to version 9.2.3, which fixes the issue.

Patch / fix

  • apache traffic_server 9.2.3
  • trafficserver Debian 12 9.2.3+ds-1+deb12u1

debian advisories DEBIAN-CVE-2023-39456

  • trafficserver9 Alpine 3.24, Alpine 3.23, Alpine 3.22 +1 more 9.2.3-r0

alpine advisories ALPINE-CVE-2023-39456

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-39456 updated

trafficserver: improper input validation vulnerability

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
2 y ago

Exploit prediction

58.29% chance of exploitation in the next 30 days, higher than 99.1% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Apache Software Foundation Apache Traffic Server
  • apache traffic_server

Classification

Weakness
  • CWE-20 Improper Input Validation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.