CVE-2023-39533

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

1.50% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 72.5% of scored records. A rank, not a probability.

NVD base score

7.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-09-01.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2023-08-08 18:50Z3 YR AGO

Last updated

2026-09-01 21:35Z3 DAYS AGO

Reserved

2023-08-03

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

High (CVSS 7.5)

CNA CVSS vector

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

Weaknesses

• CWE-770Allocation of Resources Without Limits or ThrottlingBase

Data version

5.2

Document digest

78e698e77f2934d412ad9dfa6f19e5a51096cf56305341bba1f06313be291fb4

• github.comhttps://github.com/libp2p/go-libp2p/security/advisories/GHSA-876p-8259-xjggx_refsource_CONFIRM
• github.comhttps://github.com/golang/go/issues/61460x_refsource_MISC
• github.comhttps://github.com/libp2p/go-libp2p/pull/2454x_refsource_MISC
• github.comhttps://github.com/quic-go/quic-go/pull/4012x_refsource_MISC
• github.comhttps://github.com/golang/go/commit/2350afd2e8ab054390e284c95d5b089c142db017x_refsource_MISC
• github.comhttps://github.com/libp2p/go-libp2p/commit/0cce607219f3710addc7e18672cffd1f1d912fbbx_refsource_MISC
• github.comhttps://github.com/libp2p/go-libp2p/commit/445be526aea4ee0b1fa5388aa65d32b2816d3a00x_refsource_MISC
• github.comhttps://github.com/libp2p/go-libp2p/commit/e30fcf7dfd4715ed89a5e68d7a4f774d3b9aa92dx_refsource_MISC
• nrdax.comhttps://nrdax.com/techniques/NRDAX-T0205-pre-handshake-crypto-cpu-burnx_refsource_MISC