CVE-2023-275355.9MediumCWE-305

CVE-2023-27535: Haxx https://github.com/curl/curl vulnerability

Haxx · https://github.com/curl/curl

Vendor fix available · Affected: Haxx https://github.com/curl/curl · Exploitation: possible (1 to 10%)

Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.

1.8%probability of exploitation in the next 30 days

78th percentile

050100

Higher than 78% of scored CVEs

5.9MediumCVSS 3.1

LowMediumHighCrit.

DescriptionCVE.org

An authentication bypass vulnerability exists in libcurl <8.0.0 in the FTP connection reuse feature that can result in wrong credentials being used during subsequent transfers. Previously created connections are kept in a connection pool for reuse if they match the current setup. However, certain FTP settings such as CURLOPT_FTP_ACCOUNT, CURLOPT_FTP_ALTERNATIVE_TO_USER, CURLOPT_FTP_SSL_CCC, and CURLOPT_USE_SSL were not included in the configuration match checks, causing them to match too easily. This could lead to libcurl using the wrong credentials when performing a transfer, potentially allowing unauthorized access to sensitive information.

Affected products1

From the CVE record. A product or version that is not listed is unknown, not unaffected.

https://github.com/curl/curlFixed in 8.0.0

On the Atlas

Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.

Open the Atlas

Exploitation: Possible (1 to 10%). EPSS between 1% and 10%.
CISA KEV: Not listed
Public check: No public nuclei template
Weakness: Authentication Bypass by Primary Weakness · Authentication
Vendor: Haxx
Published: March 2023
Band: Possible (1 to 10%), March 2023
Bounty reports: 3 disclosed on HackerOne

Disclosed bug bounty reports about CVE-2023-27535

The reports on HackerOne that name this CVE, with HackerOne's own outcome. Titles and metadata only.

CVE-2023-27535: FTP too eager connection reuseInternet Bug Bounty · 2023 · medium severityValid
A server response that answers nothing is used as the next transfer's reply — and with IMAP, a fully compliant server does this by accidentcurl · 2026 · medium severityN/A
CVE-2023-27535: FTP too eager connection reusecurl · 2023 · medium severityValid

CoverageNo articles yet

No CyberSIXT article names CVE-2023-27535 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.