CVE-2023-27537 — A double free vulnerability exists in libcurl <8.0.0 when sharing HSTS data between separate ...

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

1. Identify exposed assets running the affected vendor/product/version combinations (Broadcom Brocade Fabric Operating System Firmware, Haxx Libcurl, Netapp Active Iq Unified Manager…).
2. The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
3. No fix documented in the sources: reduce exposure and monitor the vendor advisory.
4. Search available logs for exploit probes matching the vulnerability class (memory corruption), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-415 · Double Free

Other CVEs with this weakness →

EPSS over time FIRST

Oct 14, 2026 → Oct 15, 2026 · 2 reading(s) · max 1.90%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

• Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
• Correlate service crashes/restarts with inbound traffic; repeated crashes may indicate attempts.

Timeline

What happened to this CVE, newest first.

• 2026
• Record published
  Oct 14, 2026
• Affected products added · haxx/libcurl, netapp/active iq unified manager, netapp/clustered data ontap, broadcom/brocade fabric operating system fi
  Oct 14, 2026 · NIST National Vulnerability Database
• CVSS changed · 5.9
  Oct 14, 2026 · NIST National Vulnerability Database
• Source status changed · → Modified
  Oct 14, 2026 · NIST National Vulnerability Database
• Record created in this database
  Oct 14, 2026 · Alertas do Telegram
• 2023
• CVE published
  Mar 30, 2023 · hackerone

Source activity

Repeated readings are counted rather than listed.

• 2× References added · Oct 14, 2026 – Oct 14, 2026
• 1× Official description updated · Oct 14, 2026 – Oct 14, 2026

References

8 on the record

• nvd.nist.gov/vuln/detail/CVE-2023-27537
  GitHub Security Advisories
• security.netapp.com/advisory/ntap-20230420-0010/
  Third Party Advisory, NIST National Vulnerability Database
• cert-portal.siemens.com/productcert/html/ssa-398330.html
  NIST National Vulnerability Database
• hackerone.com/reports/1897203
  Exploit, Third Party Advisory, NIST National Vulnerability Database
• github.com/advisories/GHSA-9j2c-vm53-wcvm
  GitHub Security Advisories
• cert-portal.siemens.com/productcert/html/ssa-943925.html
  NIST National Vulnerability Database
• security.netapp.com/advisory/ntap-20230420-0010
  GitHub Security Advisories
• security.gentoo.org/glsa/202310-12
  Third Party Advisory, vendor-advisory, NIST National Vulnerability Database

Elsewhere on this site

Related CVEs (same products)

• Critical CVE-2024-54085 AMI MegaRAC SPx Authentication Bypass by Spoofing Vulnerability KEV Mar 11, 2025
• Low CVE-2025-0167 netrc and default credential leak Feb 5, 2025
• High CVE-2025-0665 eventfd double close Feb 5, 2025
• High CVE-2025-0725 gzip integer overflow Feb 5, 2025
• High CVE-2025-0411 7-Zip Mark of the Web Bypass Vulnerability KEV Jan 25, 2025
• Low CVE-2024-11053 netrc and redirect credential leak Dec 11, 2024

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

• No fixed version, patch or mitigation documented.
• No CISA SSVC assessment.
• No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
• No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
• No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2023-27537 is "A double free vulnerability exists in libcurl <8.0.0 when sharing HSTS data between separate ...", rated Medium. It affects Brocade Fabric Operating System Firmware (Broadcom); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 5.9 describes technical severity. EPSS 1.90% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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