How severe is CVE-2023-28768?

CVE-2023-28768 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2023-28768 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-28768?

CVE-2023-28768 primarily affects Zyxel Xgs2220-30 Firmware. In total, 11 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-28768?

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

When was CVE-2023-28768 published?

CVE-2023-28768 was published on 2023-08-14 and last updated on 2026-06-17.

CVE-2023-28768

CVE-2023-28768 is a medium-severity vulnerability in Zyxel Xgs2220-30 Firmware with a CVSS 3.x base score of 6.5. 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-755.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (19th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-755
Affected product: Zyxel Xgs2220-30 Firmware
Published: 2023-08-14
Last modified: 2026-06-17

Description

Improper frame handling in the Zyxel XGS2220-30 firmware version V4.80(ABXN.1), XMG1930-30 firmware version V4.80(ACAR.1), and XS1930-10 firmware version V4.80(ABQE.1) could allow an unauthenticated LAN-based attacker to cause denial-of-service (DoS) conditions by sending crafted frames to an affected switch.

Frequently asked questions

What is CVE-2023-28768?: Improper frame handling in the Zyxel XGS2220-30 firmware version V4.80(ABXN.1), XMG1930-30 firmware version V4.80(ACAR.1), and XS1930-10 firmware version V4.80(ABQE.1) could allow an unauthenticated LAN-based attacker to cause denial-of-service (DoS) conditions by sending crafted frames to an affected switch.
How severe is CVE-2023-28768?: CVE-2023-28768 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2023-28768 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-28768?: CVE-2023-28768 primarily affects Zyxel Xgs2220-30 Firmware. In total, 11 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-28768?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2023-28768 published?: CVE-2023-28768 was published on 2023-08-14 and last updated on 2026-06-17.

References

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-dos-vulnerability-of-xgs2220-xmg1930-and-xs1930-series-switches

Affected products (11)

cpe:2.3:o:zyxel:xgs2220-30_firmware:4.80\(abxn.1\):*:*:*:*:*:*:*
cpe:2.3:o:zyxel:xgs2220-30f_firmware:4.80\(abye.1\):*:*:*:*:*:*:*
cpe:2.3:o:zyxel:xgs2220-30hp_firmware:4.80\(abxo.1\):*:*:*:*:*:*:*
cpe:2.3:o:zyxel:xgs2220-54_firmware:4.80\(abxp.1\):*:*:*:*:*:*:*
cpe:2.3:o:zyxel:xgs2220-54fp_firmware:4.80\(acce.1\):*:*:*:*:*:*:*
cpe:2.3:o:zyxel:xgs2220-54hp_firmware:4.80\(abxq.1\):*:*:*:*:*:*:*
cpe:2.3:o:zyxel:xmg1930-30_firmware:4.80\(acar.1\):*:*:*:*:*:*:*
cpe:2.3:o:zyxel:xmg1930-30hp_firmware:4.80\(acas.1\):*:*:*:*:*:*:*
cpe:2.3:o:zyxel:xs1930-10_firmware:4.80\(abqe.1\):*:*:*:*:*:*:*
cpe:2.3:o:zyxel:xs1930-12f_firmware:4.80\(abzv.1\):*:*:*:*:*:*:*
cpe:2.3:o:zyxel:xs1930-12hp_firmware:4.80\(abqf.1\):*:*:*:*:*:*:*

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