Page generated: 09 Nov 2026, 05:58 UTC
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CVE-2023-44487

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.

CVSS 7.5 (HIGH) KEV: KNOWN CATALOG

Attention and evidence

HYPE SCORE
0.0/10
REALITY · THREAT PRIORITY
8.6/10
General review priority; not probability

Evidence confidence: Exploitation recorded

Why this priority?
  • Recorded exploitation baseline: +7.00
  • Technical severity: CVSS 7.5: +1.12
  • Fresh EPSS: 100.00%: +0.50

General review priority, not probability, victim count or asset-specific risk. A range covers missing CVSS/EPSS inputs within the current evidence state.

Sources: 14 documents and public datasets.

Hype components

Headline sample (25%)
0/100
Press, 30 days (60%)
0/100
Grounded branding (15%)
0/100
HYPE TOTAL0/100

Sources and documents

Cyfirma
Press · 26 Aug 2025, 07:00 · CVE-2025-8671 – HTTP/2 MadeYouReset Vulnerability DDoS Attack - Cyfirma
Huntress
Press · 11 Jul 2025, 07:00 · CVE-2023-44487 Vulnerability: Analysis, Impact, Mitigation - Huntress
Arctic Wolf
Press · 17 Oct 2023, 07:00 · Recommendations for CVE-2023-35349 & CVE-2023-36434 - Arctic Wolf
GBHackers News
Press · 11 Oct 2023, 07:00 · Massive DDoS Attack Leveraged Zero-Day in HTTP/2 Rapid Reset - GBHackers News
Cisco Talos Blog
Press · 11 Oct 2023, 07:00 · What to know about the HTTP/2 Rapid Reset DDoS attacks - Cisco Talos Blog
See all 14 source documents
Snyk
Press · 11 Oct 2023, 07:00 · Find and fix HTTP/2 rapid reset zero-day vulnerability CVE-2023-44487 - Snyk
SecurityWeek
Press · 11 Oct 2023, 07:00 · Organizations Respond to HTTP/2 Zero-Day Exploited for DDoS Attacks - SecurityWeek
Help Net Security
Press · 10 Oct 2023, 07:00 · Microsoft fixes exploited WordPad, Skype for Business zero-days (CVE-2023-36563, CVE-2023-41763) - Help Net Security
The Record from Recorded Future News
Press · 10 Oct 2023, 07:00 · New technique leads to largest DDoS attacks ever, Google and Amazon say - The Record from Recorded Future News
Google Cloud
Press · 10 Oct 2023, 07:00 · Google mitigated the largest DDoS attack to date, peaking above 398 million rps - Google Cloud
Qualys
Press · 10 Oct 2023, 07:00 · Understanding the HTTP/2 Rapid Reset Attack (CVE-2023-44487) - Qualys
Help Net Security
Press · 10 Oct 2023, 07:00 · Dangerous vulnerability can be exploited to carry out massive DDoS attacks (CVE-2023-44487) - Help Net Security
Cloudflare Blog
Press · 10 Oct 2023, 07:00 · HTTP/2 Rapid Reset: deconstructing the record-breaking attack - Cloudflare Blog
BleepingComputer
Press · 10 Oct 2023, 07:00 · New 'HTTP/2 Rapid Reset' zero-day attack breaks DDoS records - BleepingComputer

Score evolution

● Hype   ● Reality

Earlier evidence-support scores are retained in history; this chart shows only the current priority definition.

First record: hype 0.0 · reality 8.6 (2026-11-02 15:13). The curve appears once the score changes.

Public exploit evidence

7

Public exploit entries / repo candidates

See 7 repos with metrics
RepositoryStarsForksLanguageUpdated
imabee101/CVE-2023-444875616Python13 Oct 2023, 11:19
threatlabindonesia/CVE-2023-44487-HTTP-2-Rapid-Reset-Exploit-PoC122Python16 Dec 2025, 05:54
moften/CVE-2023-44487-HTTP-2-Rapid-Reset-Attack21Python06 Nov 2025, 20:26
tpirate/cve-2023-44487-POC20Python14 Dec 2025, 16:53
tahaXafous/CVE-2023-44487-dos10Python18 Jul 2026, 09:50
BMG-Black-Magic/CVE-2023-4448700Python19 Feb 2025, 08:16
ReGeLePuMa/HTTP-2-Rapid-Reset-DDos00Go21 Jan 2026, 18:02
Public exploit evidence
Evidence context and dated references

Reality is general threat/review priority, combining observed exploitation, CVSS severity and fresh EPSS. Evidence confidence is separate. This is not calibrated risk, a victim count or an asset-specific assessment. A range reflects missing numeric inputs.

Evidence in context

Confidence in exploitation evidence
Exploitation recorded
Priority basis
Recorded exploitation; CVSS 7.5; EPSS 100.0%
Attention, last 30 days
0 distinct story titles; 0 press documents; 0 publisher domains.
Technical potential
network access, no prior privileges, no user interaction.
Observed activity
Exploitation recorded in CISA KEV.
Known scale
Not quantified.
Evidence confidence basis
Trusted exploitation confirmation

Score evaluated: 2026-11-05 13:58:59.307003+00:00 · EPSS snapshot: 2026-11-05T12:03:04Z

Source event timeline
Published
10 Oct 2023, 00:00
Added to the CISA KEV catalog
10 Oct 2023, 00:00
First press mention
10 Oct 2023, 07:00
Latest press mention
26 Aug 2025, 07:00
Score calculated
05 Nov 2026, 13:58
PoCs on GitHub
7 repositories