CVE-2021-22876 — curl 7.1.1 to and including 7.75.0 is vulnerable to an "Exposure of Private Personal Information...

Triage

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

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Remediation

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

• Documented patch — cert-portal.siemens.com (NIST National Vulnerability Database)
• Documented patch — curl.se (NIST National Vulnerability Database)
• Documented patch — hackerone.com (NIST National Vulnerability Database)

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 Fabric Operating System, Debian Debian Linux, Fedoraproject Fedora…).
2. The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
3. Apply the fixed version or the patch documented under Remediation.
4. EPSS ahead of 92% of scored CVEs: prioritize it in the patch queue.
5. Search available logs for exploit probes matching the vulnerability class (info disclosure), 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-200 · Exposure of Sensitive Information

Other CVEs with this weakness →

EPSS over time FIRST

Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 5.30%

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).
• Look for anomalous data read/export volumes and access to sensitive records.

Timeline

What happened to this CVE, newest first.

• 2026
• SSVC assessment updated
  Oct 14, 2026 · CVE Program (cve.org) e CISA ADP
• Record published
  Oct 14, 2026
• Fix documented
  Oct 14, 2026 · NIST National Vulnerability Database
• Affected products added · haxx/libcurl, fedoraproject/fedora, netapp/hci management node, netapp/solidfire, netapp/hci compute node, netapp/hci st
  Oct 14, 2026 · NIST National Vulnerability Database
• CVSS changed · 5.3
  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
• 2021
• CVE published
  Apr 1, 2021 · 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

21 on the record

• hackerone.com/reports/1101882
  Exploit, Issue Tracking, Patch, Third Party Advisory, x_refsource_MISC, NIST National Vulnerability Database
• curl.se/docs/CVE-2021-22876.html
  Patch, Vendor Advisory, x_refsource_MISC, NIST National Vulnerability Database
• cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf
  Patch, Third Party Advisory, x_refsource_CONFIRM, NIST National Vulnerability Database
• lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ITVW
  Mailing List, Third Party Advisory, vendor-advisory, x_refsource_FEDORA, NIST National Vulnerability Database
• lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KQUIOY
  GitHub Security Advisories
• github.com/advisories/GHSA-jjr6-2g8j-hmwr
  GitHub Security Advisories
• nvd.nist.gov/vuln/detail/CVE-2021-22876
  GitHub Security Advisories
• lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2ZC5BM
  GitHub Security Advisories
• security.netapp.com/advisory/ntap-20210521-0007/
  Third Party Advisory, x_refsource_CONFIRM, NIST National Vulnerability Database
• lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ITVWPV
  GitHub Security Advisories
• security.gentoo.org/glsa/202105-36
  Third Party Advisory, vendor-advisory, x_refsource_GENTOO, NIST National Vulnerability Database
• lists.debian.org/debian-lts-announce/2021/05/msg00019.html
  Mailing List, Third Party Advisory, mailing-list, x_refsource_MLIST, NIST National Vulnerability Database
• www.oracle.com//security-alerts/cpujul2021.html
  Third Party Advisory, x_refsource_MISC, NIST National Vulnerability Database
• lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2ZC5
  Mailing List, Third Party Advisory, vendor-advisory, x_refsource_FEDORA, NIST National Vulnerability Database
• lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KQUI
  Mailing List, Third Party Advisory, vendor-advisory, x_refsource_FEDORA, NIST National Vulnerability Database
• lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2ZC5
  GitHub Security Advisories
• cert-portal.siemens.com/productcert/html/ssa-398330.html
  NIST National Vulnerability Database
• cert-portal.siemens.com/productcert/html/ssa-389290.html
  NIST National Vulnerability Database
• security.netapp.com/advisory/ntap-20210521-0007
  GitHub Security Advisories
• lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ITVW
  GitHub Security Advisories
• lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KQUI
  GitHub Security Advisories

Elsewhere on this site

Related CVEs (same products)

• Medium CVE-2026-94581 An OS command injection vulnerability exists in the REST API management interface of Brocade... 7d
• Medium CVE-2026-94587 A buffer overflow vulnerability exists in the WebTools administrative interface handling... 7d
• Medium CVE-2026-94586 A command injection vulnerability exists in the WebTools administrative interface handling... 7d
• High CVE-2026-94585 An authentication bypass vulnerability exists in the web management interface of Brocade Fabric... 7d
• High CVE-2026-94579 An OS command injection vulnerability exists in the PAM (Pluggable Authentication Module) session... 7d
• High CVE-2026-94577 A privilege escalation vulnerability exists in the internal Command-Line Interface (CLI)... 7d

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 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-2021-22876 is "curl 7.1.1 to and including 7.75.0 is vulnerable to an "Exposure of Private Personal Information...", rated Medium. It affects Fabric Operating System (Broadcom); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 5.3 describes technical severity. EPSS 5.30% 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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