CVE-2021-27219 — An issue was discovered in GNOME GLib before 2.66.6 and 2.67.x before 2.67.3. The function...

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, Debian Debian Linux, Fedoraproject Fedora…).
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, 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-681

Other CVEs with this weakness →

EPSS over time FIRST

Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 2.99%

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).

Timeline

What happened to this CVE, newest first.

• 2026
• Record published
  Oct 14, 2026
• Affected products added · gnome/glib, fedoraproject/fedora, netapp/active iq unified manager, netapp/cloud backup, netapp/e-series performance ana
  Oct 14, 2026 · NIST National Vulnerability Database
• CVSS changed · 7.5
  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
  Feb 15, 2021 · mitre

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

13 on the record

• lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772
  mailing-list, x_refsource_MLIST, NIST National Vulnerability Database
• cert-portal.siemens.com/productcert/html/ssa-398330.html
  NIST National Vulnerability Database
• lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2REA7R
  GitHub Security Advisories
• github.com/advisories/GHSA-2wvj-9m7h-43j3
  GitHub Security Advisories
• nvd.nist.gov/vuln/detail/CVE-2021-27219
  GitHub Security Advisories
• lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JJMPND
  GitHub Security Advisories
• security.gentoo.org/glsa/202107-13
  Third Party Advisory, vendor-advisory, x_refsource_GENTOO, NIST National Vulnerability Database
• lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JJMP
  vendor-advisory, x_refsource_FEDORA, NIST National Vulnerability Database
• security.netapp.com/advisory/ntap-20210319-0004/
  Third Party Advisory, x_refsource_CONFIRM, NIST National Vulnerability Database
• lists.debian.org/debian-lts-announce/2022/06/msg00006.html
  Mailing List, Third Party Advisory, mailing-list, x_refsource_MLIST, NIST National Vulnerability Database
• gitlab.gnome.org/GNOME/glib/-/issues/2319
  Exploit, Issue Tracking, Third Party Advisory, x_refsource_MISC, NIST National Vulnerability Database
• lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2REA
  vendor-advisory, x_refsource_FEDORA, NIST National Vulnerability Database
• lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772
  GitHub Security Advisories

Elsewhere on this site

Related CVEs (same products)

• High CVE-2026-12996 A use-after-free in OpenVPN 2.6.0 through 2.6.20 and 2.7_alpha1 through 2.7.4 allows remote... Jul 30, 2026
• Medium CVE-2026-14355 ext/openssl: Memory corruption in openssl_encrypt with AES-WRAP-PAD Jul 3, 2026
• High CVE-2026-58013 Glib: buffer over-read in glib/giochannel.c via "g_io_channel_read_line_backend" Jun 30, 2026
• High CVE-2026-58012 Glib: buffer over-read in g_regex_replace() via glib/gregex.c:string_append() and g_utf8_next_char() Jun 30, 2026
• High CVE-2026-58011 Glib: out-of-bounds read in glib/gdatetime.c:g_date_time_get_ymd via invalid gdatetime Jun 30, 2026
• High CVE-2026-58010 Glib: buffer over-read in glib/gvariant-serialiser.c via gvs_tuple_is_normal() Jun 30, 2026

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-2021-27219 is "An issue was discovered in GNOME GLib before 2.66.6 and 2.67.x before 2.67.3. The function...", rated High. 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 7.5 describes technical severity. EPSS 2.99% 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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