CVE-2023-27783Public exploitNetwork attack vector

Process abort via unchecked null cleanup context

Published Mar 16, 2023 · Updated Feb 26, 2025

Reachable assertion in Tcpreplay tcprewrite 4.4.3 allows remote attackers to abort the process through a crafted pcap file. The DLT_JUNIPER_ETHER cleanup path passes a null subcontext to tcpedit_dlt_cleanup, whose ctx assertion terminates execution. Exploitation requires an operator to process the attacker-supplied capture with tcprewrite in jnpr_eth mode, limiting impact to that CLI process.

CVSS severity7.5
High
EPSS probability1.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reachable assertion in Tcpreplay tcprewrite 4.4.3 allows remote attackers to abort the process through a crafted pcap file. The DLT_JUNIPER_ETHER cleanup path passes a null subcontext to tcpedit_dlt_cleanup, whose ctx assertion terminates execution. Exploitation requires an operator to process the attacker-supplied capture with tcprewrite in jnpr_eth mode, limiting impact to that CLI process.

The record

CVE
CVE-2023-27783
Published
Mar 16, 2023
Updated
Feb 26, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-617, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 16, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 26, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-617Reachable Assertion
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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