How severe is CVE-2006-4343?

CVE-2006-4343 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2006-4343 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 17% (97th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2006-4343?

CVE-2006-4343 primarily affects Openssl. In total, 20 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2006-4343?

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

When was CVE-2006-4343 published?

CVE-2006-4343 was published on 2006-09-28 and last updated on 2026-06-16.

CVE-2006-4343

CVE-2006-4343 is a medium-severity vulnerability in Openssl with a CVSS 2.0 base score of 4.3. Its EPSS exploit-prediction score of 17% places it in the 97th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-476.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 17% (97th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-476
Affected product: Openssl
Published: 2006-09-28
Last modified: 2026-06-16

Description

The get_server_hello function in the SSLv2 client code in OpenSSL 0.9.7 before 0.9.7l, 0.9.8 before 0.9.8d, and earlier versions allows remote servers to cause a denial of service (client crash) via unknown vectors that trigger a null pointer dereference.

Frequently asked questions

What is CVE-2006-4343?: The get_server_hello function in the SSLv2 client code in OpenSSL 0.9.7 before 0.9.7l, 0.9.8 before 0.9.8d, and earlier versions allows remote servers to cause a denial of service (client crash) via unknown vectors that trigger a null pointer dereference.
How severe is CVE-2006-4343?: CVE-2006-4343 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2006-4343 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 17% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2006-4343?: CVE-2006-4343 primarily affects Openssl. In total, 20 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2006-4343?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2006-4343 published?: CVE-2006-4343 was published on 2006-09-28 and last updated on 2026-06-16.

References

Affected products (20)

cpe:2.3:a:openssl:openssl:0.9.7:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.7a:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.7b:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.7c:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.7d:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.7e:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.7f:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.7g:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.7h:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.7i:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.7j:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.7k:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8a:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8b:*:*:*:*:*:*:*
cpe:2.3:a:openssl:openssl:0.9.8c:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:3.1:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:5.04:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:5.10:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:6.06:*:*:*:lts:*:*:*

More vulnerabilities in Openssl

CVE-2009-3245 — Critical (CVSS 10.0): OpenSSL before 0.9.8m does not check for a NULL return value from bn_wexpand function calls in (1) crypto/bn/bn_div.c,…
CVE-2006-3738 — Critical (CVSS 10.0): Buffer overflow in the SSL_get_shared_ciphers function in OpenSSL 0.9.7 before 0.9.7l, 0.9.8 before 0.9.8d, and earlier…
CVE-2026-31789 — Critical (CVSS 9.8): Issue summary: Converting an excessively large OCTET STRING value to a hexadecimal string leads to a heap buffer…
CVE-2022-2274 — Critical (CVSS 9.8): The OpenSSL 3.0.4 release introduced a serious bug in the RSA implementation for X86_64 CPUs supporting the AVX512IFMA…
CVE-2021-3711 — Critical (CVSS 9.8): In order to decrypt SM2 encrypted data an application is expected to call the API function EVP_PKEY_decrypt().…
CVE-2016-6309 — Critical (CVSS 9.8): statem/statem.c in OpenSSL 1.1.0a does not consider memory-block movement after a realloc call, which allows remote…

All CVEs affecting Openssl →

Other CWE-476 (NULL Pointer Dereference) vulnerabilities

CVE-2022-36648 — Critical (CVSS 10.0): The hardware emulation in the of_dpa_cmd_add_l2_flood of rocker device model in QEMU, as used in 7.0.0 and earlier,…
CVE-2020-14500 — Critical (CVSS 10.0): Secomea GateManager all versions prior to 9.2c, An attacker can send a negative value and overwrite arbitrary data.
CVE-2010-2495 — Critical (CVSS 10.0): The pppol2tp_xmit function in drivers/net/pppol2tp.c in the L2TP implementation in the Linux kernel before 2.6.34 does…
CVE-2026-46195 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: smb: client: validate dacloffset before building…
CVE-2026-31657 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: batman-adv: hold claim backbone gateways by…
CVE-2026-31436 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: dmaengine: idxd: fix possible wrong descriptor…

Browse all CWE-476 (NULL Pointer Dereference) vulnerabilities →

Threat intelligence

Threat-intel indicators referencing this CVE:

90.160.135.217 (ipv4-addr)
62.36.19.42 (ipv4-addr)
62.36.19.41 (ipv4-addr)