CVE-2021-36980

MEDIUMNVD 5.55.5—

5.5

Open vSwitch (aka openvswitch) 2.11.0 through 2.15.0 has a use-after-free in decode_NXAST_RAW_ENCAP (called from ofpact_decode and ofpacts_decode) during the decoding of a RAW_ENCAP action.

CVSS v3: 5.5
EG Score: 5.5(medium)
EPSS: 23.7%
KEV: Not listed

Published

July 20, 2021

Last Modified

May 5, 2025

References (18)

cve@mitrehttps://bugs.chromium.org/p/oss-fuzz/issues/detail?id=27851
cve@mitrehttps://github.com/google/oss-fuzz-vulns/blob/main/vulns/openvswitch/OSV-2020-2197.yaml
cve@mitrehttps://github.com/openvswitch/ovs/commit/38744b1bcb022c611712527f039722115300f58f
cve@mitrehttps://github.com/openvswitch/ovs/commit/65c61b0c23a0d474696d7b1cea522a5016a8aeb3
cve@mitrehttps://github.com/openvswitch/ovs/commit/6d67310f4d2524b466b98f05ebccc1add1e8cf35
cve@mitrehttps://github.com/openvswitch/ovs/commit/77cccc74deede443e8b9102299efc869a52b65b2
cve@mitrehttps://github.com/openvswitch/ovs/commit/8ce8dc34b5f73b30ce0c1869af9947013c3c6575
cve@mitrehttps://github.com/openvswitch/ovs/commit/9926637a80d0d243dbf9c49761046895e9d1a8e2
cve@mitrehttps://security.gentoo.org/glsa/202311-16
af854a3a-2127-422b-91ae-364da2661108https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=27851
af854a3a-2127-422b-91ae-364da2661108https://github.com/google/oss-fuzz-vulns/blob/main/vulns/openvswitch/OSV-2020-2197.yaml
af854a3a-2127-422b-91ae-364da2661108https://github.com/openvswitch/ovs/commit/38744b1bcb022c611712527f039722115300f58f
af854a3a-2127-422b-91ae-364da2661108https://github.com/openvswitch/ovs/commit/65c61b0c23a0d474696d7b1cea522a5016a8aeb3
af854a3a-2127-422b-91ae-364da2661108https://github.com/openvswitch/ovs/commit/6d67310f4d2524b466b98f05ebccc1add1e8cf35
af854a3a-2127-422b-91ae-364da2661108https://github.com/openvswitch/ovs/commit/77cccc74deede443e8b9102299efc869a52b65b2

Patch Availability(7)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	openvswitch-test (2.13.3-0ubuntu0.20.04.2) @ focal	2026-05-26	ubuntu
redhat	openvswitch2.13-0:2.13.0-102.el7fdp	2022-11-21	redhat
redhat	openvswitch2.11-0:2.11.3-89.el7fdp	2021-10-20	redhat
redhat	openvswitch2.15-0:2.15.0-28.el8fdp	2021-10-18	redhat
redhat	openvswitch2.13-0:2.13.0-114.el8fdp	2021-06-21	redhat
redhat	openvswitch2.15-0:2.15.0-24.el8fdp	2021-06-21	redhat
redhat	openvswitch2.11-0:2.11.3-86.el8fdp	2021-04-12	redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-416Use After Free

All Vendor Advisories

(9)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 12× in last 7d / 20× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

2026-06-08 14:15 UTCEPSS rescore
2026-06-08 14:15 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 06:09 UTCEPSS rescore
2026-06-05 06:09 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-29 13:42 UTCEPSS rescore
2026-05-29 13:42 UTCEPSS rescore

Frequently asked(5)

What is CVE-2021-36980?

CVE-2021-36980 is a medium vulnerability published on July 20, 2021. Open vSwitch (aka openvswitch) 2.11.0 through 2.15.0 has a use-after-free in decodeNXASTRAWENCAP (called from ofpactdecode and ofpactsdecode) during the decoding of a RAWENCAP action.

When was CVE-2021-36980 disclosed?

CVE-2021-36980 was first published in the National Vulnerability Database on July 20, 2021, with the most recent update on May 5, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-36980 actively exploited?

CVE-2021-36980 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 23.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-36980?

CVE-2021-36980 has a CVSS v3 base score of 5.5 (NVD).

How do I remediate CVE-2021-36980?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-36980, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-36980

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