Skip to main content
cvebuzz

CVE mentions, exploit signals, and PoC evidence in one fast public view.

CVE detail

CVE-2021-22947

When curl >= 7.20.0 and <= 7.78.0 connects to an IMAP or POP3 server to retrieve data using STARTTLS to upgrade to TLS security, the server can respond and send back multiple responses at once that curl caches. curl would then upgrade to TLS but not flush the in-queue of cached responses but instead continue using and trustingthe responses it got *before* the TLS handshake as if they were authenticated.Using this flaw, it allows a Man-In-The-Middle attacker to first inject the fake responses, then pass-through the TLS traffic from the legitimate server and trick curl into sending data back to the user thinking the attacker's injected data comes from the TLS-protected server.

CVSS 5.9 · MediumBuzz score 17.5

Buzz score

Why this CVE is surfacing

Buzz score total 17.5

This all-time snapshot uses the same composite formula as Trending across a 30-year evidence window, rather than a current rolling window.

Buzz score components · mention 11.0 · diversity 6.5 · KEV 0.0 · OTX 0.0 · PoC 0.0
Mention score
11.0
2 evidence mentions in the snapshot
Diversity score
6.5
2 sources across 1 categories
KEV score
0.0
No KEV entry observed
OTX score
0.0
0 OTX pulses
PoC score
0.0
0 repos · best confidence N/A
Best PoC traction
0
Maximum stars on a matched PoC repo

Why it matters now

Mention timeline

Total mentions
0
within the 30d window
Peak daily
0
highest bucket

Evidence

Source links by recency

Newest mentions first
2 source links · newest first
  • Microsoft takes aim at critical RCE flaws with "massive" Patch Tuesday updateITPro

    ems with internet key exchange (IKE). The flaw affecting Windows servers that are configured as a webserver, tracked as CVE-2022-21907 , allows unauthenticated cyber attackers to send specially crafted packets to targeted servers utilising the HTTP Protocol Stack. Microsoft also said the issue is wormable and recommends patching all affected servers as

    newswww.itpro.comJan 12, 2022, 10:53 AM
  • Microsoft fixes wormable RCE in Windows Server and Windows (CVE-2022-21907)Help Net Security

    The first Patch Tuesday of 2022 is upon us, and Microsoft has delivered patches for 96 CVE-numbered vulnerabilities, including a wormable RCE flaw in Windows Server (CVE-2022-21907). Vulnerabilities of note Among the publicly known flaws are a “critical” RCE in curl (CVE-2021-22947) and “important” RCE in libarchive (CVE-2021-36976) open source libraries, which have now been “fixed” in Windows 10, 11 and Server with the inclusion of the most recent versions of the libraries. But these … More →

    newswww.helpnetsecurity.comJan 11, 2022, 8:16 PM

Exploit code

Public exploit repository references

Public PoC repositories are third-party, potentially unsafe artifacts. Treat their code as untrusted and use it only on authorized systems in an isolated, least-privilege environment. cvebuzz does not execute the code or verify that an exploit works.

0 repository references · best confidence N/A · max 0 stars
No public PoC repositories have been matched yet.

Related records

Similar CVEs

6 related CVEs with shared weakness or product evidence