CVE-2022-27939

Process abort via unchecked recursive parse result

Published Mar 26, 2022 · Updated Aug 3, 2024

Reachable assertion in Tcpreplay tcprewrite 4.4.1 allows local users to crash the utility by opening a crafted packet capture. The get_layer4_v6 loop recurses on an IPv6-in-IPv6 header but fails to stop when the recursive call returns NULL, so the next call hits its non-null assertion. Execution requires a user to run tcprewrite on an attacker-supplied pcap; the resulting abort interrupts only that process.

CVSS severity5.5
Medium
EPSS probability1.04%
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 4.4.1 allows local users to crash the utility by opening a crafted packet capture. The get_layer4_v6 loop recurses on an IPv6-in-IPv6 header but fails to stop when the recursive call returns NULL, so the next call hits its non-null assertion. Execution requires a user to run tcprewrite on an attacker-supplied pcap; the resulting abort interrupts only that process.

The record

CVE
CVE-2022-27939
Published
Mar 26, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 26, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record 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 vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.5UbuntuCVSS:3.1/AV:L/AC:L/PR:N/UI:R/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.

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No observations available

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

Weakness, pattern, technique

T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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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