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CVE-2023-44487

7.5, high Known exploited

HTTP/2 Rapid Reset Attack Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab) CISA KEV catalogue (opens in a new tab)
CVSS
7.5, high high CVSS v3.1
EPSS, next 30 days
100% higher than 99.9% of scored CVEs
Exploitation
Confirmed in the wild
Published
10 Oct 20233 years ago

Known exploited

CISA added this to the Known Exploited Vulnerabilities Catalog on 10 Oct 2023. US federal agencies had to remediate by 31 Oct 2023, a deadline that has passed.

Required action. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Description

The HTTP/2 protocol allows a denial of service (server resource consumption) because request cancellation can reset many streams quickly, as exploited in the wild in August through October 2023.

Details

Vendor
IETF and 1 more
Product
http
Weakness
CWE-400 (opens in a new tab)
Status
Analyzed
Updated
11 Aug 2026
Assigner
cve@mitre.org

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

References 173

Exploit code 2

Patches and fixes 24

16 more

Advisories 72

64 more

Other references 75

67 more

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other IETF CVEs

Every IETF CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2023-29552 Service Location Protocol (SLP) Denial-of-Service Vulnerability KEV EPSS 64% 7.5, high

Beyond this page

Is CVE-2023-44487 in your network?

This page tells you how dangerous CVE-2023-44487 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

CVE-2023-44487 is in the CISA catalogue of exploited vulnerabilities: attackers are already exploiting it.

  • EXYS7600 OCELOT

    Find it before attackers do

    Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2023-44487 comes with the devices to patch.

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  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

    Learn more about EXYS7950 KONDRA
Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.