CVE-2023-27537Not scoredCWE-415

CVE-2023-27537: Siemens https://github.com/curl/curl vulnerability

Siemens · https://github.com/curl/curl

Vendor fix available · Affected: Siemens 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.

1.9%probability of exploitation in the next 30 days

79th percentile

050100

Higher than 79% of scored CVEs

Not scored yet. The CVE record carries no CVSS score.

DescriptionCVE.org

A double free vulnerability exists in libcurl <8.0.0 when sharing HSTS data between separate "handles". This sharing was introduced without considerations for do this sharing across separate threads but there was no indication of this fact in the documentation. Due to missing mutexes or thread locks, two threads sharing the same HSTS data could end up doing a double-free or use-after-free.

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: Double Free · Memory Corruption
Vendor: Siemens
Published: March 2023
Band: Possible (1 to 10%), March 2023
Bounty reports: 4 disclosed on HackerOne

Disclosed bug bounty reports about CVE-2023-27537

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

Shared HSTS cache accessed without lockcurl · 2026N/A
CURLOPT_HSTS_CTRL disables shared HSTS without share guard — use-after-free and double-freecurl · 2026Informative
CVE-2023-27537: HSTS double-freecurl · 2023 · low severityValid
CVE-2023-27537: HSTS double-freeInternet Bug Bounty · 2023 · low severityValid

CoverageNo articles yet

No CyberSIXT article names CVE-2023-27537 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.