CVE-2020-24587

CVE-2020-24587 is a low-severity vulnerability in Ieee Ieee 802.11 with a CVSS 3.x base score of 2.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-327.

Key facts

• Severity: Low (CVSS 3.x base score 2.6)
• CVSS v2: 1.8
• EPSS exploit prediction: 3% (83rd percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-327
• Affected product: Ieee Ieee 802.11
• Published: 2021-05-11
• Last modified: 2026-06-17

Description

The 802.11 standard that underpins Wi-Fi Protected Access (WPA, WPA2, and WPA3) and Wired Equivalent Privacy (WEP) doesn't require that all fragments of a frame are encrypted under the same key. An adversary can abuse this to decrypt selected fragments when another device sends fragmented frames and the WEP, CCMP, or GCMP encryption key is periodically renewed.

Frequently asked questions

What is CVE-2020-24587?

The 802.11 standard that underpins Wi-Fi Protected Access (WPA, WPA2, and WPA3) and Wired Equivalent Privacy (WEP) doesn't require that all fragments of a frame are encrypted under the same key. An adversary can abuse this to decrypt selected fragments when another device sends fragmented frames and the WEP, CCMP, or GCMP encryption key is periodically renewed.

How severe is CVE-2020-24587?

CVE-2020-24587 has a CVSS 3.x base score of 2.6, rated low severity. It is exploitable over an adjacent network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2020-24587 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-24587?

CVE-2020-24587 primarily affects Ieee Ieee 802.11. In total, 168 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-24587?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2020-24587 published?

CVE-2020-24587 was published on 2021-05-11 and last updated on 2026-06-17.

References

• http://www.openwall.com/lists/oss-security/2021/05/11/12
• https://github.com/vanhoefm/fragattacks/blob/master/SUMMARY.md
• https://lists.debian.org/debian-lts-announce/2021/06/msg00019.html
• https://lists.debian.org/debian-lts-announce/2021/06/msg00020.html
• https://lists.debian.org/debian-lts-announce/2023/04/msg00002.html
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-wifi-faf-22epcEWu
• https://www.arista.com/en/support/advisories-notices/security-advisories/12602-security-advisory-63
• https://www.fragattacks.com
• https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00473.html

Affected products (168)

• cpe:2.3:a:ieee:ieee_802.11:*:*:*:*:*:*:*:*
• cpe:2.3:a:linux:mac80211:-:*:*:*:*:*:*:*
• cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
• cpe:2.3:o:arista:c-100_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:arista:c-110_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:arista:c-120_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:arista:c-130_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:arista:c-200_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:arista:c-230_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:arista:c-235_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:arista:c-250_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:arista:c-260_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:arista:c-65_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:arista:c-75_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:arista:o-105_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:arista:o-90_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:arista:w-118_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:arista:w-68_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:1100_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:1100-4p_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:1100-8p_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:1101-4p_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:1109-2p_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:1109-4p_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:aironet_1532_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:aironet_1542d_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:aironet_1542i_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:aironet_1552_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:aironet_1552h_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:aironet_1572_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:aironet_1702_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:aironet_1800_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:aironet_1800i_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:aironet_1810_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:aironet_1810w_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:aironet_1815_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:aironet_1815i_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:aironet_1832_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:aironet_1842_firmware:-:*:*:*:*:*:*:*
• cpe:2.3:o:cisco:aironet_1852_firmware:-:*:*:*:*:*:*:*

More vulnerabilities in Ieee Ieee 802.11

• CVE-2022-47522 — High (CVSS 7.5): The IEEE 802.11 specifications through 802.11ax allow physically proximate attackers to intercept (possibly cleartext)…
• CVE-2020-24588 — Low (CVSS 3.5): The 802.11 standard that underpins Wi-Fi Protected Access (WPA, WPA2, and WPA3) and Wired Equivalent Privacy (WEP)…
• CVE-2020-24586 — Low (CVSS 3.5): The 802.11 standard that underpins Wi-Fi Protected Access (WPA, WPA2, and WPA3) and Wired Equivalent Privacy (WEP)…

All CVEs affecting Ieee Ieee 802.11 →

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