CVE-2023-44487
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The HTTP/2 protocol allows a denial of service (server resource consumption) because request cancellation can reset many streams quickly, as…
rank 84 = 40 + 19 + 1 + 18 + 6
rank@v1 · act now
Someone is already using it
CISA KEV catalog · public proof-of-concept · FIRST EPSS
EPSS 0.99999 · CISA KEV listed · without this subject the record ranks 44
What it costs you if it fires
NVD CVSS base score, then the CNA's own
CVSS 7.5, from NVD · without this subject the record ranks 65
It is getting worse, not staying still
FIRST EPSS series, rescorings and bad loads removed
rose on 2025-11-21 · without this subject the record ranks 83
How much of the world it touches
NVD CPE configurations
255 products in the CPE ranges · without this subject the record ranks 66
Someone else already set the date
CISA KEV remediation due date
CISA remediation date held · without this subject the record ranks 78
Hindsight · the state
Foresight · where to check next
This record is one instance of CWE-400, uncontrolled resource consumption. The index holds 3986 prior instances of this class, 7 KEV-listed. The nearest of its KEV-listed records are drawn beside this. taxonomy@v1
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CISA KEV & Federal Remediation Deadline from the record and CISA
The fix, and how long it's been waiting.
Exploit Status & Known PoCs a ladder, not a score
Current rung: Exploited in the wild · CISA KEV listed, 2023-10-10.
Affected & Fixed Versions as published
Show all 255 published ranges
A rung lights from a row in the index, never from an assessment. "Held sources" is the true scope of the claim: this index reads the CVE record, NVD, CISA KEV, FIRST's EPSS and public proof-of-concept repositories, and it does not observe attacks.
$3.05M = $4.99M incident cost x 0.6121449559255632 exposure x 0.99999 likelihood
udv@v1 · unaudited · wrong for you until you say what you run
$4.99M is the cost of a breach that happened, from IBM Cost of a Data Breach Report 2026, global average. It is not the value of any asset of yours. That average already covers breaches of every severity, so scaling it by exposure understates a partial-impact record. That is an assumption, not a measurement. Your own asset value goes in the decision record.
What it is stated by the CNA
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. receipt
NVD's analysis a second authority
- severity
- 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- weakness
- CWE-400
- affected versions
- siemens simatic s7-1500 cpu 1518f-4 pn\/dp mfp firmware >= 3.1.5; siemens sinec ins < 1.0; siemens sinec ins 1.0; and 252 more, listed in full below
- also scored by
- 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
check it yourself github.com blog.cloudflare.com aws.amazon.com cloud.google.com nginx.com cloud.google.com +14 morereceipt
Dated events
Movement the material steps
This score more than doubled inside 72 hours. Both observations are in the full history below.
Show all 168 observations
168 observations held. A highlighted step crossed a promotion threshold. A step marked with a scoring model moved because the instrument was replaced, not because the vulnerability changed. receipt
The full biography
Listed by CISA on the day it published, exploit probability more than doubled between 2023-10-11 and 2023-10-12 (0.00195 → 0.00636) and the record had been public for 2 years, 10 months when this index was last written.
No material movement in 81 days as of the last ingest this index recorded.
The pattern, elsewhere
This record is one instance of CWE-400, uncontrolled resource consumption. The index holds 3986 prior instances of this class, 7 KEV-listed. The nearest of its KEV-listed records are drawn beside this. cwe-consequences@4.20
"Matches n of m" counts the attributes the two records can both be compared on: the CVSS metrics they share a version of, any weakness class beyond this one, and the vendor. fit-rules@v1
3986 records in this class held. The six above are drawn from the ones CISA has listed as exploited, ranked by how much of the record matches this one. That is why every one of them is KEV-listed: the pool is, so the colour on those spokes says nothing the pool has not already said.
No curated product neighbourhood is held for this product, so the records above are the nearest this index can name. The neighbourhood table covers a small set of products and is extended by hand.
Siblings and hubs
Records related to this one
Browse the index from here
These are index-wide views, not findings about CVE-2023-44487.
What usually comes next
Everything above needs no account. What is below is work: assembling it, scoping it to your estate, watching it, and handing it to someone else.