7.5

CVE-2023-39456: apache software foundation apache traffic server Improper Input Validation

CVSS: 7.5v3.1HighModified
AliasesUBUNTU-CVE-2023-39456DEBIAN-CVE-2023-39456
Published 17-10-2023Last modified 12-06-2025
Open JSON

Vulnerability summary

CVE-2023-39456 is a high (CVSS 7.5) Improper Input Validation vulnerability in apache software foundation apache traffic server. EPSS estimates a 58.29% chance of exploitation in the next 30 days, higher than 99% of scored vulnerabilities.

Overall risk
42/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
58.29%
0%100%
Critical · +4.53 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 17-10-2023
    PublishedVulnerability first disclosed.
  2. 12-06-2025
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

58.29%

Chance of exploitation in the next 30 days

Percentile

99%

Versus all other CVEs

30-day change

+4.53 pp

From 53.76% on 19-09-2026

19-09-202619-10-2026
EPSS score
58.29%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Apache1 product
Apache software foundation1 product
Debian1 product
  • trafficserver< 9.2.3+ds-1+deb12u1
Fedoraproject1 product
Ubuntu1 product
  • trafficserverAll versions (No fix recorded)

5 vendors · 5 products

References

8 links