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Vulnerability record · CVE-2021-36980 · published 20 July 2021

CVE-2021-36980: Openvswitch use after free vulnerability

Openvswitch · Openvswitch

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.

5.5 CVSS 3.1 Medium EPSS 1.2% · top 33.5% CWE-416 · Use after free
5.5CVSS 3.1 base score, v2 4.3
1.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
18References
17 Jun 2026Last modified by NVD

Description

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:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=27851 PatchThird Party Advisory
https://github.com/google/oss-fuzz-vulns/blob/main/vulns/openvswitch/OSV-2020-2197.yaml Third Party Advisory
https://github.com/openvswitch/ovs/commit/38744b1bcb022c611712527f039722115300f58f PatchThird Party Advisory
https://github.com/openvswitch/ovs/commit/65c61b0c23a0d474696d7b1cea522a5016a8aeb3 PatchThird Party Advisory
https://github.com/openvswitch/ovs/commit/6d67310f4d2524b466b98f05ebccc1add1e8cf35 PatchThird Party Advisory
https://github.com/openvswitch/ovs/commit/77cccc74deede443e8b9102299efc869a52b65b2 PatchThird Party Advisory
https://github.com/openvswitch/ovs/commit/8ce8dc34b5f73b30ce0c1869af9947013c3c6575 PatchThird Party Advisory
https://github.com/openvswitch/ovs/commit/9926637a80d0d243dbf9c49761046895e9d1a8e2 PatchThird Party Advisory
https://security.gentoo.org/glsa/202311-16
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=27851 PatchThird Party Advisory
https://github.com/google/oss-fuzz-vulns/blob/main/vulns/openvswitch/OSV-2020-2197.yaml Third Party Advisory
https://github.com/openvswitch/ovs/commit/38744b1bcb022c611712527f039722115300f58f PatchThird Party Advisory
https://github.com/openvswitch/ovs/commit/65c61b0c23a0d474696d7b1cea522a5016a8aeb3 PatchThird Party Advisory
https://github.com/openvswitch/ovs/commit/6d67310f4d2524b466b98f05ebccc1add1e8cf35 PatchThird Party Advisory
https://github.com/openvswitch/ovs/commit/77cccc74deede443e8b9102299efc869a52b65b2 PatchThird Party Advisory
https://github.com/openvswitch/ovs/commit/8ce8dc34b5f73b30ce0c1869af9947013c3c6575 PatchThird Party Advisory
https://github.com/openvswitch/ovs/commit/9926637a80d0d243dbf9c49761046895e9d1a8e2 PatchThird Party Advisory
https://security.gentoo.org/glsa/202311-16

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2022-4338Openvswitch out-of-bounds read vulnerabilityAn integer underflow in Organization Specific TLV was found in various versions of OpenvSwitch.EPSS 1.3%9.8CVE-2022-4337Openvswitch out-of-bounds read vulnerabilityAn out-of-bounds read in Organization Specific TLV was found in various versions of OpenvSwitch.EPSS 1.3%9.8CVE-2017-9264Openvswitch out-of-bounds read vulnerabilityIn lib/conntrack.c in the firewall implementation in Open vSwitch (OvS) 2.6.1, there is a buffer over-read while parsing malformed TCP, UDP, and IPv6…EPSS 2.4%9.8CVE-2017-9265Openvswitch out-of-bounds read vulnerabilityIn Open vSwitch (OvS) v2.7.0, there is a buffer over-read while parsing the group mod OpenFlow message sent from the controller in `lib/ofp-util.c` i…EPSS 2.8%9.8CVE-2017-9214Openvswitch vulnerabilityIn Open vSwitch (OvS) 2.7.0, while parsing an OFPT_QUEUE_GET_CONFIG_REPLY type OFP 1.0 message, there is a buffer over-read that is caused by an unsi…EPSS 2.9%9.8CVE-2016-2074Openvswitch memory buffer overflow vulnerabilityBuffer overflow in lib/flow.c in ovs-vswitchd in Open vSwitch 2.2.x and 2.3.x before 2.3.3 and 2.4.x before 2.4.1 allows remote attackers to execute …EPSS 6.3%8.8CVE-2016-10377Openvswitch memory buffer overflow vulnerabilityIn Open vSwitch (OvS) 2.5.0, a malformed IP packet can cause the switch to read past the end of the packet buffer due to an unsigned integer underflo…EPSS 0.94%7.5CVE-2023-3966Openvswitch vulnerabilityA flaw was found in Open vSwitch where multiple versions are vulnerable to crafted Geneve packets, which may result in a denial of service and invali…EPSS 1.0%

Source: NIST National Vulnerability Database (record CVE-2021-36980), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.