Vulnerability Details : 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.
Published 2021-09-29 20:15:08
Updated 2023-01-05 18:25:39
Source HackerOne
View at NVD,

Exploit prediction scoring system (EPSS) score for CVE-2021-22947

Probability of exploitation activity in the next 30 days: 0.10%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 40 % EPSS Score History EPSS FAQ

CVSS scores for CVE-2021-22947

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Source
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CWE ids for CVE-2021-22947

References for CVE-2021-22947

Products affected by CVE-2021-22947

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