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NVD / CVE Program· CNA apache

CVE-2024-31309: Apache Traffic Server: HTTP/2 CONTINUATION frames can be utilized for DoS attack

Noroxi assessment

Priority: Plan (action score 58/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 92.4% (FIRST EPSS); higher than 99.8% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: trafficserver9 (Alpine:v3.21) 9.2.4-r0; trafficserver (Debian:10) 8.1.7-0+deb10u4; trafficserver (Debian:11) 8.1.10+ds-1~deb11u1.

Add it to your regular patch cycle. Upgrade to trafficserver9 (Alpine:v3.21) 9.2.4-r0; trafficserver (Debian:10) 8.1.7-0+deb10u4; trafficserver (Debian:11) 8.1.10+ds-1~deb11u1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

HTTP/2 CONTINUATION DoS attack can cause Apache Traffic Server to consume more resources on the server.  Version from 8.0.0 through 8.1.9, from 9.0.0 through 9.2.3 are affected. Users can set a new setting (proxy.config.http2.max_continuation_frames_per_minute) to limit the number of CONTINUATION frames per minute.  ATS does have a fixed amount of memory a request can use and ATS adheres to these limits in previous releases. Users are recommended to upgrade to versions 8.1.10 or 9.2.4 which fixes the issue.

HighCVSS 7.5 · v3.1—No exploit Fix available
Published
Apr 10, 2024
Updated
Jun 17, 2026
EPSS
92.4% · 99th percentile

Report tools

JSON

Action score

58

Plan

Add it to your regular patch cycle.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
28 / 30 · 92.4%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
apachetraffic server
debiandebian linux
fedoraprojectfedora

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • apache traffic server8.0.0 and later · before 8.1.10
  • apache traffic server9.0.0 and later · before 9.2.4
  • debian debian linux10.0
  • fedoraproject fedora38
  • fedoraproject fedora39
  • fedoraproject fedora40

Versions reported by the vendor

Affected version ranges reported by the assigning authority (apache). Independent of NVD's CPE analysis and usually ahead of it.

  • Apache Software Foundation Apache Traffic Server

    • 8.0.0 and later · up to and including 8.1.9affected · semver
    • 9.0.0 and later · up to and including 9.2.3affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Alpine:v3.21trafficserver9before 9.2.4-r09.2.4-r0
Debian:10trafficserverbefore 8.1.7-0+deb10u48.1.7-0+deb10u4
Debian:11trafficserverbefore 8.1.10+ds-1~deb11u18.1.10+ds-1~deb11u1
Debian:12trafficserverbefore 9.2.4+ds-0+deb12u19.2.4+ds-0+deb12u1

Same product

apache: all records

Other highest-scoring records for the same primary product.

  • CVE-2023-39456Apache Traffic Server: Malformed http/2 frames can cause an abort
    47Plan
  • CVE-2015-3249The HTTP/2 experimental feature in Apache Traffic Server 5.3.x before 5.3.1 allows remote attackers to cause a denial of service…
    41Plan
  • CVE-2014-3525Unspecified vulnerability in Apache Traffic Server 3.x through 3.2.5, 4.x before 4.2.1.1, and 5.x before 5.0.1 has unknown impact and…
    41Plan

Published before and after this one in the same product

  • ← EarlierCVE-2022-47185Aug 9, 2023 · Apache Traffic Server: Invalid Range header causes a crash
    31Monitor
  • ← EarlierCVE-2023-41752Oct 17, 2023 · Apache Traffic Server: s3_auth plugin problem with hash calculation
    30Monitor
  • Later →CVE-2023-38522Jul 26, 2024 · Apache Traffic Server: Incomplete field name check allows request smuggling
    30Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
alpine:trafficserver99.2.4-r0 · Alpine:v3.21Package registry (OSV)
debian:trafficserver9.2.4+ds-0+deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days-2% in 7 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2023-39456176 days apartApache Traffic Server: Malformed http/2 frames can cause an abort
    47Plan
  • CVE-2024-35296107 days apartApache Traffic Server: Invalid Accept-Encoding can force forwarding requests
    32Monitor
  • CVE-2022-47185245 days apartApache Traffic Server: Invalid Range header causes a crash
    31Monitor
  • CVE-2023-30631301 days apartApache Traffic Server: Configuration option to block the PUSH method in ATS didn't work
    31Monitor
  • CVE-2024-38479218 days apartApache Traffic Server: Cache key plugin is vulnerable to cache poisoning attack
    30Monitor
  • CVE-2024-50305218 days apartApache Traffic Server: Valid Host field value can cause crashes
    30Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-20 · Improper Input Validation

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records